Mesu Nochi Torare(2013)

Mesu Nochi Torare is an adult anime series set during school festival preparations. Student council president Reiko and her boyfriend Shintaro are tasked with overseeing the event together. When they sample a mysterious drink from a fellow student, Reiko suddenly becomes overwhelmed by unexpected arousal. She pulls Shintaro into a darkened maze classroom, but the pair quickly become separated. When someone finds Reiko in the darkness, she loses control and gives in to her desires—only to discover afterward that her partner had already left the room. The series explores themes of desire, confusion, and the consequences of a fateful encounter during the festival's chaotic backdrop.