You're adopted by an adventurer who has a knack for using swords, Sistine, she raised you until you were eight. But at night, those of you who enjoy the scenery with Sistine suddenly surprised by the presence of Succubus Queen, she made Sistine, your mother feel an unprecedented pleasure that made her a succubus.

When the succubus queen told Sistine to be succubus to kill you through pleasure, Sistine did. You're the one on the verge of death making you think you're gonna die, but unfortunately not, Sistine has a consciousness that's telling you to leave.

A few years passed, you are now 18 years old who has a sword skill to be an adventurer to be able to save your mother from the influence of Succubus Queen.