Kyosuke, Madoka, Hiraku & friend go on a vacation to the beach, staying in 2 cabins, boys in one, girls in another. It's basically Kyosuke & Madoka get together, & Hiraku flirts with the blond guy friend. Then, Kyosuke & Madoka go night swimming with dangerous results.
| Actor | Role |
|---|---|
 Akari HibinoHikaru (voice) | Hikaru (voice) |
 Eiko YamadaYūsaku (voice) | Yūsaku (voice) |
 Saeko ShimazuMadoka (voice) | Madoka (voice) |
 Yu MizushimaKyōsuke (voice) | Kyōsuke (voice) |
 Yuko MitaKazuya (voice) | Kazuya (voice) |