Otona-chan.
A: A likes B, and they always cling together, B is seen as being childlike, then comes their new sensei, who is very young but seems so grown up. B having a fascination with the sensei makes A start to be irritated and confess to liking B, consults the teacher whose consultation makes B's feelings clear B: A works as a designer for book covers? and has been charged with guiding the newbie, non too contentedly he is harshly guiding the newbie who manages to push his innocent way into A;s heart also finding out that A is one of his favourite authors
Koi ga Odoru New Town