During one morning Kinjirō, on his way to school, ends up getting run over by a girl on a scooter. He identifies her as someone who goes to his school by her uniform only to notice that his glasses were caught in her thigh boots and he ends up causing a misunderstanding when he states "there's something in there that I want" which causes the girl to attack him. After he retrieves his glasses, the girl, who's name is revealed to be Masamune Usami, suddenly recognizes him and attacks him again while demanding how he managed to befriend Subaru and ends up knocking him out. When Kinjirō comes to he is surprised to find he was in the infirmary where it is revealed that Subaru and Kanade found him passed out on the road and brought him to school. After he nervously asks where Kanade was, Subaru notes that he had been avoiding her since the end of Golden Week (i.e. after she kisses him). Subaru states that he can tell her anything but in return shyly asks him to go to the school festival with her which he agrees too. Subaru however is shocked when he talks about his first kiss which she mistakenly believes he is referring to her (due to the pool incident where she apparently kisses him through unknown circumstances), after he states he would rather redo it she misconstrues that he wants to kiss her again and she attempts to do so only for Kanade interrupting where she slyly notes that it had been awhile since Kinjirō has talked to her. After Kinjirō recovers he ends up running into Masamune again where she explains that she was a member of the S4. She blackmails Kinjirō into pretending to be her boyfriend for the school festival in order to undermine the "Let's warmly protect Subaru-Sama comittee" but Subaru ends up overhearing and punches Kinjirō in the stomach in anger and runs off upset. Kinjirō is forced to walk Masamune to the stores where they converse and share stories about their families and they start becoming more friendly towards each other. The next day
或る日の朝、通学途中の近次郎は、ツインテールの少女が乗った原付にはねられる。 保健室で目覚めた近次郎の様子がなんだかおかしいことを心配するスバルだったが、 学園祭を近次郎と一緒にまわる約束をして密かに喜ぶ。 そんな折、近次郎は自分を保健室送りにした少女・宇佐美マサムネに呼び出される。
彼女が所属する「Ｓ４」と敵対する「スバル様を温かい眼差しで見守る会」が 学園祭で全面戦争になる、スバルを守るためにも学園祭が終わるまで 自分と恋人のふりをしろという彼女の申し出を承諾した近次郎だったが。
아침 등교길에 오토바이에 치인 지로는 가해자 우사미에게 재차 폭행을 당해 쓰러진다.
지로가 눈을 뜬 곳은 학교 보건실. 지로는 엉겁결에 스바루와 학교 축제를 함께하기로 약속하는데...
또다시 마주친 우사미는 다짜고짜 지로를 옥상으로 불러낸다.
