Taisetsu na Koto wa Subete Kimi ga Oshiete Kureta (2011)

Taisetsu na Koto wa Subete Kimi ga Oshiete Kureta 2011 / 大切なことはすべて君が教えてくれた 2011 / You Taught Me All the Important Things , You Taught Me All the Precious Things

Natsumi Uemura and Shuji Kashiwagi, are two high school teachers due to marry in six months. On the eve of the new school year's opening ceremony, Shuji becomes involved with the young Hikari Saeki, both unaware that they will face each other in class come morning. As Shuji struggles to help Hikari deal with her confusing emotions, he himself is torn apart over his betrayal of his fiancée. Driven by jealousy and a desire to destroy her teachers’ relationship, Hikari plots to get closer to Natsumi. (Source: Tokyograph; edited by Lee C)