The finale. Kenji has now formed intimate bonds with all three women. The resort’s original owner (Shizuka’s estranged father) arrives, announcing he will sell the property. To save the resort, Shizuka must prove it is financially viable. The solution? A bizarre, adults-only “Hospitality Week” where guests are invited for a secluded retreat. Kenji is torn between helping Shizuka, comforting Natsuki (whose past is revealed), and Miki’s confession of love. The episode ends with an ambiguous yet hopeful conclusion—Kenji chooses no one and everyone, suggesting an open-ended polyamorous arrangement.
The story centers on , a young teacher who heads to the fictional resort area of Amanatsuto (Southern Islands) seeking relaxation and "girl watching". However, his plans take a turn when a monkey steals his assets, forcing him to work part-time at the beach house "Triton". -Resort Boin -1-3- -EngSub--
Within its specific niche, Resort Boin remains an iconic example of late-2000s hand-drawn animation before the industry shifted entirely toward digital, cost-reduced production pipelines. Its mix of bright tropical aesthetics, lighthearted romantic comedy, and uncompromising adult themes secured its status as a classic of the era. The finale
– Daisuke arrives and is immediately pursued by Nao and Mitsugu. To save the resort, Shizuka must prove it
Nao Iihara and Mitsugu Tsukushino, two recurring characters, follow him to the island, continuing their competition for his attention.