Refrain Blue - S01

A beach trip becomes more than expected for two people mourning the loss of someone they loved. Maybe a mysterious girl known as the "Umi Warabe" can help them heal their wounds and move forward in life. Matsunaga Yoshihiro is chaperoning a group of high school students on a summer beach trip. One night he saves one of the students, Morisawa Nao, when she tries to drown herself. She had been on this same trip a year earlier with her fiancee, who was later killed in a plane crash. As the two get to know each other, it turns out Yoshihiro also carries a painful secret from his past. Watching over it all is a mysterious young girl who somehow is always there at decisive moments.