S-class adventurer, Arx, belongs to the merciless party Brutal Edge. He possesses a skill with two abilities: [Mimicry], allowing him to transform into a slime, and [Split], enabling him to create duplicates of himself. Both abilities were weak, and was considered an outcast skill. Arx, valued for his only advantage, [Split], was expelled from the party one day by the party leader, Dan. “I can’t stand looking at weaklings like you!! You slime bastard!!” Subjected to violence and insults, Arx swears revenge against Dan and vows to become stronger. To achieve strength, Arx defeats monsters. It is during this time that he discovers a shocking truth. “Could it be… the experience points double for each split!?” Arx’s skill has a hidden ability: the experience points increase for each duplicate created. Realizing this cheat-level fact, Arx rapidly levels up faster than anyone else. “I can do it…! I can catch up to Dan with this!” As Arx steadily becomes stronger, the grows as well. The number of splits increases, the slime’s level rises, and the efficiency of leveling up continues to improve. Meanwhile, Dan, the former party leader, unable to keep up with Arx’s growth, heads down the path of destruction. Before anyone realizes it, Arx reaches the realm of the ‘strongest’ that no one can catch up to. A protagonist who swiftly becomes stronger, an exhilarating expulsion story.