Kusunoki, a struggling 20-year-old, sells his lifespan for money but is shocked to learn he only has three months left to live. He meets Miyagi, who is tasked with observing him until the end.

As Kusunoki faces the consequences of his decision, he begins to understand the true value of life. This thought-provoking story explores the consequences of greed and the importance of cherishing every moment.

This is the physical copy of the Three Days of Happiness manga.