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Synopsis

Kouzou Akizuki arranges a family getaway, but his older daughter Airi resists the idea. Her sister Marina supports the trip, anticipating private moments with their father, though she will join later than planned, leaving Airi alone with Kouzou for the initial stretch. Aware of her stepfather's sexual tendencies, Airi avoids solitude with him, yet during the train ride to the hot springs she is given a strong aphrodisiac disguised as candy. The drug erodes her capacity to resist sexual impulses, a situation Kouzou has been expecting and prepared to exploit.