Mamoru Sasaki, a teacher who works overtime and gets dissed by his students, hears a mysterious announcement in school at midnight. The voice welcomes him to the Room of Guilty Pleasure, where he can pick any student he likes. Assuming that it's just a dream from the situation spread out before him, Sasaki picks one student on a whim. Led by the announcement, he enters a classroom where his sassy student, Mai Hoshino, is waiting for him, looking embarrassed...