Other Name: 不可告人的關系 ; 人に言えない間柄 ; Unspeakable Relationship (Yukimura)
Year of release: 2014
Kensuke meets, through a dating site, a certain "Michiru-san" whos erotic, has a sexy beauty mark near his mouth, and is great at playing coy. Although they both lie and claim theyre 20, Kensuke is actually 17 and Michiru-san is actually 26. Not only are they 9 years apart in age, but Michiru also ends up being a teacher at Kensukes school! As soon as the truth is out, Michiru stoically proposes to end the relationship.