Written by Naoshi Arakawa and Mizuki Tsujimura.

Illustration & cover by Naoshi Arakawa.

On a snowy day at school, childhood friends Hiroshi and Mizuki arrive at school only to discover that the college life is strangely empty. Soon, they find themselves trapped with six other friends, and the strangest thing is that all the clocks have stopped at a certain time - the time when a former classmate of theirs fell from the school roof three months earlier. It seems that this deceased friend is their way out of the predicament and may even be among their group... but no one can remember who it was that ended their life on that sad day. The students must face themselves and their old memories to piece together the identity of this suicide victim or risk a similar fate.