Aiko tries to tell Shinichirō her feelings but is interrupted when Miyokichi arrives. Miyokichi later goes shopping with Aiko and the latter stomps out of a shop flustered and tells Miyokichi that she bought the sweater that Shinichirō had picked up before. Miyokichi gets the hint and feels troubled. While frustrated about Jun approaching Hiromi during school, Shinichirō asks Noe to stop bothering him for while and ends up getting his belt being pulled out by Noe. Jun goes out with Hiromi on a date Sunday, and after they arrive back at her home, Jun tells her that Shinichirō and Noe are going out together. Later that night, Shinichirō overhears Hiromi and his mother's quarrel and has a tussle with his mother and Hiromi. Subsequently, Shinichirō finds out from Hiromi that he and Hiromi might share the same father.
愛子と三代吉のあやうくも微妙な関係は、セーター事件によって急激な展開を見せる。純の強引さに戸惑いながらも、態度を保留にしていた比呂美は、彼の耳を疑う一言に激しく動揺する。追い討ちをかけるような眞一郎の母の叱責に激昂してしまう比呂美。彼女には絶対に隠し通さねばならない秘密があったのだが･･･。
Jun fissa un appuntamento con Hiromi; nel frattempo Shin'ichirō si chiede se abbia fatto bene a organizzare l'uscita di Hiromi con Jun senza sapere quali fossero i veri sentimenti della ragazza.
La delicada relación entre Aiko y Midaikichi muestra un rápido desarrollo debido al incidente del suéter. A pesar de estar confundida por la fuerza de Jun, Hiromi, quien ha puesto su actitud en espera, se molesta por una palabra que duda de sus oídos. Hiromi se enoja con la reprimenda de la madre de Shinichiro, que parece ser una venganza. Tenía un secreto que tenía que ocultar absolutamente ...
