Teacher x Teacher relationship

Serious and kind, Noboru-sensei is a favorite at Atami Preschool. Arima-sensei is the gentle and lazy "puppy" who adores Noboru-sensei. Everyday Arima-sensei expresses his love whole-heartedly, but Noboru-sensei refuses to recognize his affection. Will Arima-sensei have no choice but to become a wolf to make his love accepted...!?

Eri is careful to hide his true character. As luck would have it, one of the new teacher assistants under his care is Motou, an old student from his past. What will Eri do, faced with those candid eyes? Thus begins the tale - spanning over years - of a romance between a faithful teacher assistant and a masquerading teacher.
In the same cram school, love is budding between Motou's hardworking friend, Izumi, and another awkward teacher named Makino. Their story is told in "Together".

1-2) Unspeakable Relationship ~ Inoue's Case
Kensuke meets, through a dating site, a certain "Michiru-san" who's erotic, has a sexy beauty mark near his mouth, and is great at playing coy. Although they both lie and claim they're 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 Kensuke's school! As soon as the truth is out, Michiru stoically proposes to end the relationship.

3) Unspeakable Relationship