While Kinnikuman is on vacation with Mari-san's kindergarten class at Easter Island, the young wheelchair-bound Kouichi-kun laments being with an idiot like Kinnikuman, preferring to instead be with his favorite Seigi Choujin Buffaloman. Meanwhile, the other Seigi Choujins are also vacationing at ancient landmarks.
| Actor | Role |
|---|---|
 Akira Kamiya(voice) | (voice) |
 Minori Matsushima(voice) | (voice) |
| SSanji Hase(voice) | (voice) |
 Hiromi Tsuru(voice) | (voice) |
| TTakashi ShimadaUkon III & His Men (voice) | Ukon III & His Men (voice) |
| YYoshinori NakaiUkon III & His Men (voice) | Ukon III & His Men (voice) |