Synopsis: Tokarev no Ayaui Shiro

During their high school years, Ayaka had great admiration for her best friend Hiroko, who suddenly vanished without any apparent reason. Hiroko had only confided to Ayaka that she was dealing with a pressing issue. Recently, Ayaka received a letter from Hiroko, which had washed up on the shore along with the body of a dead girl. In the letter, Hiroko implored Ayaka to come to her aid. Desperate to find her missing friend, Ayaka embarks on a journey to a remote all-girls' school, which seems overly eager to welcome her as a new student. Will Ayaka manage to uncover the school's cryptic secrets and save her friend before it's too late?