Memento Mori

"Remember that you must die."

Ayumu Yamaguchi, a graduating high school student suddenly went missing a month before the graduation day. Nathaniel Sorbian, her friend and the person whom she confessed to before Ayumu went missing, thought that something happened to her.

A year after, Nathan accidentally bumped to a girl. Later, he realized that it's Ayumu however the appearance seems to be the opposite to what he remembered. He noticed that Ayumu is hiding something so he did all the effort to be recognized by the lady. And also to realize the relationship that they were in.

The story is all about Ayumu and how she tried to win over the game she played with the Grim Reaper. Together with Nathaniel, they searched for Ayumu's "missing object" and found deep hidden secrets from the people around them. This twenty-four hours mystery will be solved before Death comes to them.

Memento Mori means 'remember that you must die'. This is the game between life and death.