Usotsuki-tachi e is a mystery about Daichi, who reunites with two former classmates more than twenty years after they attended elementary school in a depopulating town. Their nostalgic memories lead to the truth behind a fifth-grade water accident in which one of their friends fell into a pond and lapsed into a coma.

Former classmates reunite after more than twenty years and trace the truth behind a childhood water accident and their memories of it.

In this linked collection, two members of the Sakurado University Mystery Club tackle five everyday puzzles, including why a customer leaves an expensive cup of coffee unfinished. The title story won the first Sogen Mystery Short Story Award.

Why does a customer leave an expensive cup of coffee unfinished? Two members of the Sakurado University Mystery Club pursue five mysteries hidden in everyday life.