Dark/Friendship Titles

A teenage Okano Makoto and his younger sister, Hinata, return to the city of their birth. The sudden disappearance of their mother still bothers them deeply, but in her last letter, she asked that they use the savings that she set up to return to this city by the sea. And upon arriving they are met by two of their childhood friends, who are attending the same high school as they will be. They quickly form a friendship with several other high school students, unaware that one of their circle of friends is involved in the disappearance of both their father and their mother.