Young student Miyako Sumida hanged herself, leaving her loved ones confused. A few months before her suicide, she left for a distant mountain village, but from what or who was she trying to escape? Her classmate Ryusei, who is in love with her, and her best friend Chi go to where Miyako spent the last days of her life, and Ryusei’s sister Fumi tries to understand how help your brother survive the loss. What pushes a person to take this desperate step? And what remains of his loved ones whom he left? Doubts? Pain? Guilt? Was it possible to notice the warning signs and prevent the tragedy? The heroes will have to answer these questions and solve the mystery of Miyako Sumida's perfect death.