Makikomarete Isekai Tenisuru Yatsu wa, Taitei Cheat Omega

[Machine Translation] A high school student, Kotoyu Gyosai, is caught up with four heroes and transferred to another world. With beautiful girl slaves Misha (wolf ears), Leia (fox ears), and Luna (rabbit ears), as well as the spirit king Zero (extremely beautiful) and the demon king Calvis (tsundere) under his control, he heads for the most difficult dungeon "Kotoriasobi". This dungeon was supposed to have been built by Gosai, but for some reason, there were more tricks that he did not know about. As he investigates the dungeon, a mysterious angel descends upon him! Meanwhile, the heroes have acquired new powers, such as "Holy Knight-ization", "Dragon-ization", and "Angel-ization". The heroes who entered the demon world with their mighty power were confronted by none other than the one they had been searching for, Gyosai!

四人の勇者に巻き込まれて異世界転移した高校生・小鳥遊強斎。美少女奴隷のミーシャ(狼耳)、レイア(狐耳)、ルナ(兔耳)に加えて、精霊王のゼロ(超絶美人)と魔王キャルビス(ツンデレ)を配下に収めて、向かうは最難関ダンジョン『コトリアソビ』。このダンジョンは強斎が作ったはずなのだが、なぜか知らない仕掛けが増えていたのだ。ダンジョンを調べる強斎の前に舞い降りたのは、謎の天使だった!一方、勇者たちは新たな力、「聖騎士化」、「竜化」、「天使化」を手に入れた。その強大な力で魔界へ乗り込んだ勇者たちの前に立ちはだかったのは、他でもない、捜し求めていた強斎の姿だった!!