This episode reflects on Kanata's past with Tsukiko & Suzuya. Kanata has always been friends with them since he was little. As he grows up with them he developed feelings for Tsukiko. He has always had a weak body and feels that he can not protect them. He continues to fight because it makes him feel alive and not weak. Tsukiko and Suzuya dislike when he over does his fighting habits, even though they are unsure of his reason. (thetvdb.com)