Tsubaki-chan no Nayamigoto

Synopsis

Tsubaki started going out with Yutaka who is in the same class after he confessed to her. No mails, very silent, at first she thought it was a "mistake" to go out with him but after realizing how pure/honest Yutaka is, Tsubaki gradually falls for him. So what are the worries that the two are facing..?