​Reiko and Shintaro, the student council president and vice president, are tasked with overseeing the preparations for the cultural festival. While exploring the campus, they encounter a fellow student who offers them a taste of a special festival drink. Strangely, after consuming it, Reiko becomes uncontrollably aroused and leads Shintaro into a dimly-lit classroom set up like a labyrinth. Much to her surprise, she discovers that Shintaro has already left the room. Troubled by Reiko’s sudden behavior, Shintaro seeks the guidance of Misaki, another student council member. Suspecting Reiko’s exhaustion from festival preparations, Misaki suggests they all take a trip to an amusement park. On the day of the outing, Shintaro and Reiko meet, but Misaki is nowhere to be found. Suddenly, Reiko receives an alarming email with a shocking image that reveals the truth about Misaki’s whereabouts.​