Squid Girl decides that the Lemon should test their defenses against other invaders. But little do they know Squid Girl has other plans for this mock invasion...

A fight breaks out between Squid Girl and Eiko and this time things aren’t patching up as quickly.  With the tension in the air Chizuru closes the restaurant early so the group can go to the local Festival.  Will Squid Girl go back to the sea or will a mysterious visitor be the key.
Kiyomi, we and the Invasion Club 
are going to squidjoy ourselves!
Kiyomi, wir und der Eroberungsclub
 werden auch allein Spaß haben.
Kiyomi, ¡todas las chicas del club
 de invasión tenemos que divertirnos!
Kiyomi, todas las chicas del club
 de invasión tenemos que divertirnos.
Kiyomi, on devrait faire de même
et s’amuser entre nous !
Kiyomi, nós somos do Clube da Invasão,
 então vamos nos divertir só nós cinco!