A-ko and B-ko's pursuit of a handsome Coke-loving, motorcycle-ruding stud named Kay has a wrench thrown in when C-ko grows very jealous of him. Meanwhile, the aliens' ship floating in the bay is about to turn into the ultimate nightspot. Good luck with that, catastrophe always occurs when the three 'Ko's get together.
| Actor | Role |
|---|---|
 Miki ItoEiko 'A-ko' Magami (voice) | Eiko 'A-ko' Magami (voice) |
 Emi ShinoharaBiko 'B-ko' Daitokuji (voice) | Biko 'B-ko' Daitokuji (voice) |
 Michie TomizawaShiiko 'C-ko' Kotobuki (voice) | Shiiko 'C-ko' Kotobuki (voice) |
 Tessyo GendaKei / D (voice) | Kei / D (voice) |
| AAsami MukaidonoMiss Ayumi (voice) | Miss Ayumi (voice) |
 Daisuke GoriMari (voice) | Mari (voice) |
 Akari HibinoAsa (voice) | Asa (voice) |
 Shuichi IkedaCaptain Napolipolita (voice) | Captain Napolipolita (voice) |
 Megumi HayashibaraUme (voice) | Ume (voice) |
 Yoshino TakamoriIne (voice) | Ine (voice) |