Rumor has it that there is a witch inside room 13 of the girls' dormitory, who lures innocent, unsuspecting girls into her room at night to perform indecent acts on them....
In truth, the girl in room 13, Herazato Shie, is just unable to fall asleep at night unless she tells someone a story about the movies she has watched. So every night, she invites anyone willing to come in her room and listen to another of her stories about movies.

(Source: MangaDex)