Jirou joins the friend group when it is discovered he is tagging along after Masahiro without him knowing. He hangs out with the group of friends and comes for dinner served at the Ohshiba home often.
Later, he is the last student at school while Masahiro and Kousuke are together and think they are alone. He believes the two are fighting and hides in a broom closet, only to see them kiss. This results in Jirou revealing their secret love affair to the other guys, and drama ensuing between Masahiro and Fukushige.
