[Month Thirty-Five — Three Months After the Coordination Meeting]
Bulma arrived on a Wednesday with the expression of someone who had not slept adequately in several days and did not particularly care.
She had two prototypes.
She set them on the Lookout’s training room floor with the deliberate care of someone placing objects that had cost them something real — not financially, though they had cost that too, but in the deeper currency of attention and iteration and the specific grinding frustration of engineering problems that refused to resolve cleanly.
They were small.
Smaller than Tien had imagined from her descriptions — each one a disc approximately ten centimeters in diameter, matte black, with a small control interface on one face and a subtle texture on the other that was, she explained, the adhesive surface that bonded it to clothing or skin.
“They work,” she said.
“Before you ask.
I tested them.
Both of them.” She picked up the one on the left.
“This one is Tien’s.
This one — ” the one on the right — “is Goku’s.
Different calibration.
The ki-reactive power cell responds differently to different ki signatures, and I’ve had enough data from both of you to tune them individually.” She paused.
“I need more time to build Krillin’s and Yamcha’s.
Two weeks.”
Tien picked up his device.
It was lighter than it looked.
The control interface was three small buttons and a display no larger than the pad of his thumb showing a single number: 1.0.
“The number is the gravity multiplier,” Bulma said.
“One point zero is baseline — no modification.
You press the left button to increase in point-five increments.
Right button to decrease.
Maximum is four point zero.” She paused.
“Don’t go to four immediately.
I mean it.
Start at one point five and work up over several days.
The field is localized to approximately two meters around the user, which means if you’re in a room with someone and you activate it, they’ll feel it too.
I’ve put a ten-second delay on the maximum setting specifically to prevent accidental full activation.”
“Four times gravity, wearable, anywhere,” Tien said.
“Four times gravity, wearable, anywhere,” Bulma confirmed.
She sat down on the training room floor with the bonelessness of someone who had been sitting in a lab chair for too long and found all floors equally comfortable by comparison.
“The power cell is ki-reactive, which means it draws its energy from the user’s ambient ki field.
The higher your power level, the longer it runs between charging cycles.
At your current level — ” she glanced at the wristband he was wearing — “approximately twenty-three hours of continuous use at maximum setting before it needs to passively recharge for four hours.”
“Twenty-three hours,” Tien said.
“You’re not going to train for twenty-three consecutive hours,” Bulma said.
“But yes.
Effectively unlimited for normal training sessions.”
Tien turned the device over in his hands.
He thought about what this object represented — the months of Bulma’s parallel-track engineering, the ki-reactive power cell that was, in itself, a technology that had not existed in any form before she invented it, a fundamental advance built from first principles because a problem needed solving and she was the person who could solve it.
“Bulma,” he said.
She looked up from where she had apparently already started making notes on her tablet.
“This is one of the most important things anyone has done in the preparation for what’s coming,” he said.
“I want you to know I understand that.”
She looked at him for a moment with the expression she wore when she was deciding whether to accept a compliment or redirect it.
Then she said: “I know.
That’s why I didn’t sleep.” She went back to her tablet.
“Goku’s device — make sure he understands the delay mechanism.
He’s going to immediately try to go to four times and I’ve built in the delay specifically because I know that about him.”
“I’ll tell him,” Tien said.
“Tell him twice,” she said.
He tested it that afternoon, alone in the training room with the door closed, the Lookout empty of everyone except Mr.
Popo in the kitchen and Chiaotzu reading on the eastern terrace.
He set the device at 1.5.
Felt the field activate — a smooth, immediate compression, familiar in quality from the gravity room but different in texture, the field slightly less uniform at the edges than the room’s mechanism, a faint awareness of where the two-meter boundary was.
He walked.
Ran.
Dropped into the warm-up kata that was the beginning of every training session.
At 1.5, it was light work.
He adjusted the device to 2.0.
Better.
A real demand.
His ki engaging to compensate, the wristband updating: 2,310, 2,320 as the body moved up to meet the load.
He went to 2.5.
Sparred with the air, the shadow-work that was both warm-up and technique maintenance.
His ki output was elevated, the compensation mechanism working continuously, each movement costing more than it would at normal gravity.
The sensation was familiar and also completely new — familiar because he knew what gravity training felt like, new because he was standing in a room at normal gravity and the field was entirely generated by the device on his wrist.
He could do this anywhere.
On a road.
In a field.
In a tournament.
He could walk through the world at 2.5 gravity while appearing to do nothing.
The implications of this hit him gradually, then all at once.
All the time, he thought.
Not just in the training sessions.
All the time.
Sleeping.
Eating.
Walking between places.
Every hour of every day for the next twelve months, the body working against elevated gravity.
He had not done the math on this before because the technology hadn’t existed to make it relevant.
He did it now.
The gravity room training had been six days a week, two to three hours per session.
Even accounting for the senzu recovery cycles, the total hours under elevated gravity were perhaps twenty to twenty-five per week.
With the wearable, at modest settings, he could be under elevated gravity for a hundred and sixty hours a week — every waking hour, and even sleeping, if he kept it at a low setting overnight.
The growth rate was going to accelerate dramatically.
He pressed the button to 3.0 and began a proper training session, and did not come out of the training room for four hours, and when he did his power level on the wristband read 2,390 — an increase of one hundred and fifty points in a single afternoon, the ceiling having been breached twice and the pathways running genuinely hot.
He found the senzu supply, took one bean, felt the restoration move through him, and ate dinner at the Lookout’s kitchen table with Chiaotzu and Mr.
Popo and thought about twelve months and what they were now going to produce.
[Month Thirty-Five, One Week Later — Goku]
He brought Goku’s device to Paozu Province himself.
He had been to Goku’s home only once before — briefly, in month fourteen, the first meeting having led to a standing invitation that he’d visited when the circuit brought him nearby.
The house was modest and surrounded by the specific domestic evidence of a household with a small child: a fenced garden with toddler-scale disturbances in the soil, a pile of child-sized training equipment that was either Chi-Chi’s preparation for Gohan’s future or Goku’s optimism manifesting in physical form, a washing line with laundry that was various combinations of orange training gi and infant garments in domestic proximity.
Chi-Chi met him at the door.
This was a relationship that required care.
Chi-Chi in the series had been treated, often, as an obstacle — the reasonable domestic needs of a family used as comedic friction against Goku’s desire to train and fight.
Tien had always found that framing incomplete.
Chi-Chi was a woman who had married a man she loved who happened to be, by any objective measure, the single most dangerous person alive, and who had spent years navigating the reality that he was going to be pulled toward the kinds of conflicts that could kill him, and who was trying to protect the life she’d built.
Her priorities were not wrong.
They were just in tension with a necessity that she didn’t fully know about yet.
She was not going to know about it from him today.
That was Goku’s conversation.
“Tien Shinhan,” she said, with the neutral tone of a person who had opinions about Goku’s training companions and was holding them in check out of politeness.
“Chi-Chi,” he said.
“I’m sorry to show up without more notice.
I have something for Goku — a training tool.
I’ll only stay a few minutes.”
She looked at him with dark, sharp eyes that assessed quickly.
“He’s in the back,” she said, and stepped aside.
Goku was in the backyard, which was a large open space bordered by trees that had been cleared at its center specifically to create a training area.
He was doing something with a large boulder — not throwing it, not crushing it, but moving it with a careful, controlled ki application that suggested he was practicing precision rather than power.
On the ground beside him, watching with the solemn attention of a nineteen-month-old who has decided this particular activity is worth studying, was Gohan.
The child had Goku’s eyes and Chi-Chi’s face and the slightly surprised expression of someone who is discovering, on a daily basis, that the world contains more than yesterday’s inventory.
He looked up when Tien approached and regarded him with the assessment of a toddler, which is purely instinctive and quite honest, and apparently found him acceptable, because he returned his attention to the boulder.
Goku set the boulder down and grinned.
“Tien.
You came all the way down here?”
“I have something you need,” Tien said.
He produced the device.
Explained what it was, what it did, Bulma’s instructions, the delay mechanism, the caution about starting at 1.5 rather than jumping straight to maximum.
Goku held it and looked at it with the specific quality of attention he gave things he found genuinely interesting.
Tien watched him recalibrate — the body adjusting, the ki engaging, the slight shift in his posture as the compensation began.
“Interesting,” Goku said.
“You can wear it all the time,” Tien said.
“Every hour, at whatever setting your body can manage without breaking down.
The growth rate is going to be different than anything you’ve done before.”
Goku looked at the device.
Then he looked at Gohan, who had abandoned the boulder study and was now toddling toward his father with the determined wobble of someone whose walking was recent enough to still require concentration.
Goku picked him up without looking, the motion completely automatic, and the child settled against his shoulder with the ease of a person who had been picked up by these particular hands many times.
“Twelve months,” Goku said, looking at Tien.
“Approximately.”
“And I need to be at eighteen thousand.”
“Yes.”
Goku bounced Gohan gently, the child’s hand finding Goku’s ear and investigating it.
“The Kaio-ken,” he said.
It was not a question.
He had said the name before — in the coordination meeting, Tien had referenced it obliquely, the technique that would eventually be available to him — and Goku had the mind of a fighter, which meant that techniques went in and stayed in.
“When the path opens,” Tien said.
“Yes.”
“What is it?
Can you tell me that much?”
Tien thought about what to share.
The Kaio-ken had been developed by King Kai — it was not something he could give Goku the instructions for, because the instructions didn’t exist in this world, they existed in the Other Side and would be given to Goku by a teacher he hadn’t met yet.
Describing it mechanically would be like giving someone a recipe in a language they didn’t speak.
“It’s a multiplier,” he said.
“It does what my compression technique does, but through a different mechanism and at a higher ceiling.
When you have it, eighteen thousand becomes a floor rather than a ceiling.” He paused.
“What you can do right now is develop the base that the Kaio-ken builds on.
The stronger your base when you learn it, the higher the multiplied output.”
Goku absorbed this.
Gohan had moved from the ear to the hair and was pulling it with the experimental interest of a scientist testing a hypothesis.
“How strong is my base now?” Goku asked.
“Honestly?
I estimate your true ceiling at approximately fifteen hundred, if you were pushing against it fully.
Your resting state reads much lower, but when you’re genuinely engaged—”
“Fifteen hundred,” Goku said.
He said it in the same tone someone might say so there’s a lot of mountain left.
Not dismayed.
Oriented.
“Fifteen hundred,” Tien confirmed.
“You have twelve months.
With that device at the settings your body can handle, and the urgency I think you now have — you’ll be considerably higher than fifteen hundred when it matters.”
“How much higher?”
“That depends on you,” Tien said.
“I won’t estimate.
You’re the variable I can’t calculate.”
Goku looked at him with those clear eyes and then, unexpectedly, he laughed.
Not the social laugh, not the polite one — the real one, the full-chest version that had warmth in it and not a trace of performance.
“I like that,” Goku said.
“You’re the only person I know who tells me I’m the part they can’t calculate and makes it sound like a compliment.”
“It is a compliment,” Tien said.
“It’s also why you’re the reason any of this is possible.”
Goku handed him Gohan — the transfer was sudden and Tien found himself holding a nineteen-month-old with the particular startled competence of someone who has handled small children approximately never and is now discovering that they are heavier than they look and more interested in your face than you expected.
Gohan regarded Tien with those large eyes.
His ki signature, visible through the third eye, was extraordinary — not large, nothing like Goku’s, but with a quality that was its own thing entirely, a depth of latent potential that radiated up from beneath the child’s surface like heat from stone that has been in the sun all day.
You’re going to be remarkable, Tien thought at him.
And you’re going to have a better run at it than you did before.
Gohan grabbed his nose.
“He does that to everyone,” Goku said, settling the device on his wrist and examining the interface.
“I see that,” Tien said, and gently extracted his nose from the child’s grip.