This is a world where demons and humans coexist.
The Demon King is an awe-inspiring being born out of fear and hatred of humans.

--The demon king is a beautiful demon king (Lv 75), who is supposed to be a demon king, but instead of destroying the world, he retreats to his castle and spends his days in peace and tranquillity.
The demon king, who is told by his household that he will be defeated one day if he continues in this way, is unwilling to go into the city to find peace, but encounters a hero (lvl 99) and is struck down by the level difference between the two.
The Demon King is not satisfied with this, but the hero begins to admire him, and feeling his chastity in danger, he manages to escape back to his castle and fortify it, but the hero invades the castle with ease, and the Demon King rises to take revenge...?
此処は魔物と人間が共存する世界。
人間の恐怖と憎悪から生まれた、畏怖される存在の魔王。

――のはずが、世界を滅ぼすこともせず自身の城に引きこもり、穏やかな日々を過ごす麗しい魔王(Lv75)がいた。
「このままではいつか倒される」と眷属に苦言を呈された魔王は、気乗りしないまま己の安穏のためにと街に攻め入ったところでカンスト目前の勇者(Lv99)に遭遇、レベルの差に打ちのめされてしまう。
コトはそれだけでは済まず、勇者に見初められてしまい貞操の危機を感じた魔王はなんとか逃げ帰り城の守りを固めるもいとも簡単に勇者が城に侵入、魔王は返り討ちにしようと立ち上がるが…?