Principal Kuma Kocho has sent the IChu on a summer vacation as a present. Each of them set out to make the most of their vacation on a private beach reserved just for them, but Mutsuki seems unhappy somehow. Then, one by one, people start going missing... The IChu that are left find a mansion deep in the forest and head inside to search for their friends.
Just what we expected 
from the greatest of twins!
!كما هو متوقّع من أفضل توأم
Genau so erhofft man es sich
von den besten Zwillingen.
Con razón son los gemelos invencibles.
Con razón sois los gemelos invencibles.
Vous n’êtes pas les meilleurs jumeaux
pour rien.
Proprio quello che ti aspetteresti 
dai gemelli migliori del mondo!
Não esperava menos dos maiores gêmeos.
Что и ожидалось от лучших братьев.