Trailer: Secret by Hayato Kawai

While Minato (Taiga Kyomoto) was studying music abroad he had a traumatic experience and then transferred to a prestigious music school back in Japan. He hears Yukino (Kotone Furukawa) playing a piece on the piano that has him transfixed. He asks her about the song, but she won't tell him about it and says the title is a secret. Taiga and Yukino form a bond together as Taiga gradually overcomes his trauma. But suddenly one day Yukino vanishes.