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 SpiritTW:• 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