I just watched a movie live action of this manga.In chapter 1 he kissed the kouhai because he tried to help the blonde guy from getting attacked by the kouhai without hurting the kouhai feelings and because he scared that the kouhai would not be able to give up the blonde guy ( ̄∇ ̄"). In the movie it happened the same but then the dark hair guy meet the blonde guy and make it clear that he was just lied to protect the blonde guy and there will never be a thing between them and the kouhai said that even if the dark hair guy have a girl/boyfriend, he would never thought of stealing the dark hair guy away. Now this is different than in the manga ╮( ̄▽ ̄)╭.
I just watched a movie live action of this manga.In chapter 1 he kissed the kouhai because he tried to help the blonde guy from getting attacked by the kouhai without hurting the kouhai feelings and because he scared that the kouhai would not be able to give up the blonde guy ( ̄∇ ̄"). In the movie it happened the same but then the dark hair guy meet the blonde guy and make it clear that he was just lied to protect the blonde guy and there will never be a thing between them and the kouhai said that even if the dark hair guy have a girl/boyfriend, he would never thought of stealing the dark hair guy away. Now this is different than in the manga ╮( ̄▽ ̄)╭.
Hope this help anyone who confused chapter 1.