Apparently a sports manga, with a classic love triangle between a young man like many others, his friend, talented, and the girl who both are interested. But in reality these issues it will take over soon other more dramatic. The city is in fact disrupted by a strong earthquake that awakens monsters.

Bousouzoku playing ping pong.

A small group of adults have been invited to a reunion at their old high school to remember the loss of their classmate Kiriko, after receiving a letter "From K."

Not knowing who "K" is, Ryosuke, a young man with short black hair that used to know Kiriko, has to uncover the truth of Kiriko's mysterious death. As he slowly regains his memories and his fellow classmates start suddenly dying around him in the most horrific manner, he realises that it's far too late to say sorry.

(Source: MU)