Aoki finds Rin sitting up in a tree. He tries to apologize for his earlier behavior. Rin shows off her new look, "low-rise", which is extremely revealing. Reiji unwillingly allows her to wear it. He walks her to school, trying to block other parents' view of her. He is accused of being a molester because of his close proximity to Rin's backside. Aoki and Reiji have a silent mental conversation threatening/accusing one another. Before leaving, Rin kisses Reiji good-bye, which makes Aoki (for reasons even he does not understand) jealous. Rin becomes the Class Representative. The day passes and Rin appears to be making a sincere effort to be a good Class Rep. Aoki asks her to have the class clean the backyard after class. When he enters his classroom after it is over, he notices that all the students backpacks are gone. He immediately misinterprets this as that they ditched the work. Aoki finally runs into Mimi and Kuro, who are cleaning the backyard. Rin realizes that he had no trust in her to complete the request he made and, sincerely hurt, she runs away. Aoki finds her up in the tree. After accepting Aoki's apology, she goes to climb down, slips, and falls revealing her body. Aoki is slapped for this, but forgiven as usual.

青木发现凛坐在树上。他试图为之前的行为道歉。凛炫耀着她的新造型——“低腰裤”，这身打扮非常暴露。玲二勉强让她穿上。他送她去学校，试图挡住其他家长的视线。他因为靠近凛的臀部而被指控为性骚扰者。青木和玲二默默地在心里对话，互相威胁/指责。临走前，凛吻别玲二，这让青木（连他自己都不明白）感到嫉妒。凛成为了班长。这一天过去了，凛似乎在真心实意地努力做好班长。青木让她下课后帮全班打扫后院。下课后，他走进教室，发现所有学生的书包都不见了。他立刻误以为他们逃课了。青木终于碰到了正在打扫后院的美美和小黑。凛意识到他不相信她能完成他的请求，她真的受到了伤害，逃走了。青木在树上找到了她。她接受了青木的道歉后，爬了下来，滑倒摔了下去，露出了她的尸体。青木为此挨了一巴掌，但还是像往常一样得到了原谅。

4年生になったりん、黒、美々。学級委員長を決めることになり、美々が押し付けられそうになってしまう。その時、りんが委員長に立候補。自分をかばうためにりんが立候補したのではないかと気にする美々だが、「自分のため」と言うりん。そんな中、クラスメイトをうまくまとめているりんを見た青木は、りんを見直すが…。