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.
Satsuki and Futami... 
Where could they be?
ساتسكي وفوتامي... أين يمكن أن يكونا؟
Wo können Satsuki und Futami
denn nur hin sein?
¿Adónde habrán ido Satsuki y Futami?
¿Adónde habrán ido Satsuki y Futami?
Où sont passés Satsuki et Futami ?
Satsuki e Futami...
Satsuki e Futami... para onde foram?
Сацуки и Футами...
Куда же они ушли?