Refrain Blue

For two people who are grieving the deaths of their loved ones, a trip to the beach ends up being more than they had anticipated. They might be able to recover from their injuries and move on with their lives with the aid of a mysterious girl known as the "Umi Warabe." High school pupils are being accompanied by Matsunaga Yoshihiro on a summer beach trip. One evening, he intervenes to save Morisawa Nao, one of the classmates, from an attempted drowning. With her fiancee, who was eventually killed in an airplane disaster, she had taken the same same journey a year earlier. Yoshihiro also has a dark secret from his past, which is revealed as these two grow to know one another. A mysterious young girl who strangely always appears at critical periods is keeping an eye on everything.