Kimi ga Koi ni Ochiru

Kimi ga Koi ni Ochiru (You Fall in Love) by Takanaga Hinako starts when Mochizuki Haru has subbed in to teach and is made student advisor of the Archery club and is forced to deal with painful memories involving one of the students (Tsukasa) and the student's brother (Reiichirou).
(Source: Hochuuami)