Refrain Blue

Matsunaga Yoshihiro accompanies a group of high school students on a summer beach trip. One student, Morisawa Nao, had been on the same trip a year earlier with her fiancé, who died in a plane crash. After Yoshihiro saves Nao from a failed suicide attempt, they form a bond as they both deal with their respective losses. A girl known as the "Umi Warabe" seems to be present at pivotal moments, possibly offering some guidance.