Kaito is tired of being drained by his succubus childhood friend, Lidi, who dominates his dreams every night. Seeking a way to fight back, he makes a deal with the wish-granting Melusine-sensei, leading to a shift in power and a passionate confession of love. The tension culminates in an intense encounter in the real world where Kaito finally takes control, eventually joined by Sensei for a decadent finale.