Three construction companies are bidding for the construction of an art museum. One of them is the construction company run by Shiori's father. Today, Shiori is on a pre-wedding trip to a hot spring with her fiance Ichiro. Shiori's father is also going to the same hot spring for a construction union meeting. Despite the hot spring trip, her fiance Ichiro is spending the whole day fishing with his father-in-law. With her sexual desires running wild, Shiori flirts with the president of the construction company she is bidding against.