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Upon turning 15, Allen is bestowed by the gods with the unfortunate profession of Tamer. A Tamer is a combat class that befriends monsters and fights alongside them. However, due to his extreme weakness, he cannot defeat monsters to make them his companions. Due to his incompetence, Allen was subjected to unfair treatment by those around him.

One day, Allen luckily finds and defeats a rare monster, a Green Slime, and obtains the unique skill [Absorption]. [Absorption] was a skill that could be called perfect for a Tamer, as it allowed him to acquire the abilities of tamed monsters. The number of monsters he can absorb is limitless, and the more he absorbs, the stronger Allen becomes.

To make the most of his ability, Allen becomes an adventurer and rapidly grows stronger by continuously absorbing monsters.

The adventure story of a laughingstock who changes the world begins!