I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too, Vol. 5 (light novel) - Carley Radford, Rein Kuwashima, Miku Miku

Corrupted by the Dark Side!After a narrowly won battle, Yuti surrenders to Master Rabbit and Yuuya, abandoning her plan to destroy humanity. She has no home to return to, so Yuuya offers up his. However, traces of demonic energy remain inside Yuti, and there’s no telling when they might take over, so Yuuya decides to risk transferring them to himself. Will he be able to resist his dark impulses and the temptation of power?