The Ruri no Fune Academy is a school where young people from all over the country who have dreams gather to study hard every day. The school is not a boys school, but the percentage of male students is 100%, and it is called a gray ship where neither color nor love can be found. However, recently, the head of the school has hired professional female teachers in various fields, and they have become popular among the male students as if they were some kind of idols.

Kanata Shindo, the main character, has left his hometown due to unavoidable circumstances and has come to Japan. Kanata is a special student, and for several months, in addition to his regular classes, she takes after-school supplementary classes in order to graduate.

In charge of the supplementary classes are the matronly female teachers that the boys at the school adore. The relationship between Kanata and the teachers becomes "intimate" with a "special" distance from the other boys...