Bleach : The God of Flames

The Vongola ring is fake. The flames burning through his chest? Absolutely real. Ichigo's mother dies in one year. Tsuna says watch me. That's the problem with gods. You don't see them coming until the world is already on fire. Aizen didn't see him. Yhwach didn't see him. Soul Society didn't see him. Now they're all burning. — Description from novelcodex.org