Last year I resolved tensions with Haruna, the source of my trauma, and made overall progress on my misanthropic tendencies. Now I’ve proudly witnessed another student’s graduation and set new goals for myself as a teacher. There aren’t any students advancing to the next grade...but that's when three mysterious beauties appear at my school! They claim they’re the principal’s sisters and that they’ve come to get their brother back. And not only that, they want to join my advanced class! Needless to say, I’ve got some worries about my fourth year here at Shiranui Private High School...