Teppei, who just transferred into Kaimei Academy, is attacked by a mysterious masked paint-chucker, Paint Mask.

Takemitsu Shinzou is obsessed with being a samurai and is captain of the kendo team, but in spite of his skill, he keeps losing during tournaments.

Himeko was once a delinquent feared far and wide, and though she's totally reformed, she starts to hear odd rumors that the Onihime has started going on a rampage again.

Saotome Roman, member of the Manga Club, runs into her prince on the way back from school in the rain; in order to meet him again, Roman comes to the Sket-dan for help.

Yuuki Reiko, member of the Occult Club, barges into the Sket-dan's room holding a picture of one of Kaimei Academy's seven mysteries, the Ghost of the Incinerator.

Tsubaki from the Student Council tells the Sket-dan they're going to be disbanded, and to prove the Sket-dan's effectiveness, Bossun takes on a request to put on a play for a local preschool.