Konatsu asks a male coworker to pose as her boyfriend in front of the parents pressuring her to marry, so he accompanies her to the family home. To make the relationship convincing, they end up bathing together. Her flushed cheeks, shampoo-scented wet hair, firm skin, and water-slicked breasts overwhelm him, and a suggestion that they wash each other turns into full-body groping. She protests that he is taking things too far, but they must keep acting like a loving couple in front of her parents. Sharing a futon and trying on a wedding dress make the next three days feel increasingly real, until their pent-up lust finally reaches its limit and the fake romance threatens to become genuine.