Only I Level Up By Shoveling

Everyone else transmigrated and became a human, but Castra transmigrated and became a summon spirit. Even worse, he was an animal Poop Shoveler Spirit, the lowest of the lowest F-rank spirit! Summoners despise him and they gave him 1 star reviews. Bad review= no summons= die!; Oh God, help! God heard Castra's prayer— and sent him a poop. DUNG! [Behold! The great Poop system is here! You only need to shovel and you will level up, becoming the greatest SSS-Rank spirit!] Castra: So easy? what to shovel? DUNG! [Shovel an orange cat's poop ×10] [Reward: SSS-Rank Nyan Nyan Punch Skill] ...is this a joke?? A joke or not, Castra already got his death sentence. BEEP. [Dear spirit, you have accumulated five 1 star reviews in a row from your summoners.] [As per the Spirit World's regulation, you will be annihilated in 3...2...1...] ———— Former title: SSS-Rank Poop Shoveler Spirit TW: • A lot of swearing related to sh*t • A lot of poop-related skills (don't worry, all animal Poop) Power level: • Summoners & summon spirits: -F-rank to SSS rank • Dungeon monsters & wild monsters: F-rank to SSS rank • Mage: 1 circle- 9 circles • Stats: 1 star-5 stars