Hiiragizaka no Kyuukan

Hero is a freelance writer. Because he has asthma, he visits a hot springs resort and stays at a small ryokan. A relaxed atmosphere governs here, but one day a dead body is found at the resort. The corpse is dried of liquid. Hero is interested in the incident and starts his own investigation.

Despite the detective synopsis it's a normal eroge and the mystery solves itself at some point. There is an ending for each woman in the hot springs as well as bad endings. The branching is logical, it's mostly choice whether to H or not and whether to get bad ending or not.