There are young women that  work for the country for the objective of satiating the sexual desire of students, in an effort to prevent possible sexual crimes, particularly in educational institutions. 

The reasons for  young women to take on such a "career" are various, however there are common features: They don't use clothes, they are always naked and they are called by number, their name is unknown to anyone...

Naoto is a university student. One day, he meets Ayane, his old friend, by chance after an interval of several years. Also, Chika, his old friend as well, suddenly appears in front of him. She tells him to become her tutor and they start living together...but will Naoto will resist the temptation of those delicious big boobs?

Kimi no na wo yobe ba  Vol. 1  CENSORED/ENGLISH SUBTITLES

Kimi no na wo yobe ba  Vol. 2  CENSORED/ENGLISH SUBTITLED