Des：Three construction companies are bidding on construction work for a certain museum. One of them was a construction company run by Shioris father. Today, Shiori is on a pre-marital hot spring trip with her fiancé Ichiro. Shioris father also decided to go to the same hot springs for a meeting of the civil engineering association. Even though its a long-awaited hot spring trip, her fiancé Ichiro is fishing with his father-in-law. Shiori, who is overwhelmed with her sexual desire, uses her flirtation with the president of the construction company who is making a bid for her.