Rurinofune (lapislazuli ship) Academy –– The school where ambitious young students from all over the country gather day after day in the pursuit of knowledge. It's not a boys school per se, however, the student body consists of 100% males, which makes people refer to it as the "aromantic stone ship." However, lately the principal has been employing more professional women teachers, who are adept in many fields. Those women have been enjoying reverence and popularity as though they were idols by the male student body. Our protagonist, Arato Kanata, had been moving away from his prestigious hometown and came to Japan and attends Rurinofune Academy as an off-season transfer student. In order to have a chance at graduation, he has to take some after-school remedial classes for several months. And the girls responsible for these classes are those cherished girls that all the students yearn for. Being closer to these teachers than the average student, the character of Kanata's relationship with them soon turns intimate...