Tantei wa Sauna de Nazo wo Totonoeru

Ryuji Mizuta, who works as a detective, is told by his former boss and father-in-law Ryutaro Yagura that he wants to become a detective after he retires. Mizuta tries to solve the mystery of a certain incident, but Ryutaro's deductions are always off the mark. However, when Ryutaro takes him to the sauna, Ryutaro begins to demonstrate his detective skills...

The story depicts Ryutaro as he warms up in a sauna, cools down in a cold bath, and takes a break on a bench as he resolves his health and mysteries.