The owner of Minamikaze has invited the girls of Lemon to his home, once there the mood changes drastically.  How can the girls escape?  Squid Girl is suffering from amnesia and everybody is trying to convince her she is an alien, girlfriend, or sister, but what about invader?  The Invasion Club has been formed, join and watch how they systematically invade the city.
And I think we can consider 
our school invaded as well.
Und ich denke, unsere Schule wird als Nächstes fallen.
Y creo que también podríamos 
contar la escuela.
Y creo que también podríamos 
contar el instituto.
Je pense qu’on peut considérer
l’école comme envahie aussi.
E acho que também podemos considerar 
a invasão da nossa escola.