Ep. 9: Professor Itsuki gifts Kaoru and Aoi a romantic sea trip to Yokohama

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Professor Itsuki rewards Kaoru for her contributions to his institute by gifting two tickets for a sea voyage to Yokohama. He insists on accompanying his girlfriend, but since all female tenants except Aoi are away or occupied, Kaoru sees this as an opportunity to spend time alone with her. The pair checks into a hotel for the duration of their stay. During the night, the two characters appear to cross personal boundaries, with events suggesting that Kaoru and Aoi engage in sexual activity. This intimate encounter marks a significant shift in their relationship dynamics as they navigate their feelings away from the usual household distractions.