Kiyoshi Fujino is one of these new boys, but he discovers to his shock that he and his four friends—Takehito "Gakuto" Morokuzu, Shingo Wakamoto, Jouji "Joe" Nezu, and Reiji "Andre" Andou—are the only male students among 1,000 girls.

Their capture and "arrest" by the Underground Student Council causes the five boys to receive an ultimatum: either stay a month in the school's Prison Block or be expelled.

It was directed by Tsutomu Mizushima, with Michiko Yokote handling series composition and writing the scripts, Junichirō Taniguchi designing the characters and props and Kōtarō Nakagawa composing the music.

The voice actors of the five male main characters performed the opening and ending theme songs under the group name Kangoku Danshi.

The next day, Meiko takes the boys to the Chairman's office and but they are interrupted by news that Gakuto has run amok inside the school and the girls are beating him up.

The boys explain that while Hana returned Kiyoshi to prison, Chiyo sneaked in the back door of the Corrections Office and performed a three-way clothing exchange with Gakuto and Joe.

A live-action television drama adaptation was announced in August 2015, directed by Noboru Iguchi at production studio Robot.

[20] The broadcast dub version of the anime was criticized for altering the original meaning of a line while referencing the Gamergate controversy, written by Tyson Rinehart.