In a future world where invaders from another dimension have driven humanity to live on floating islands in the sea, Hida Kizuna becomes a member of the elite Amaterasu squadron.  In order to power up the mech suits of this all-girls combat team, he has to... do lewd things to them!?
Sis! Is that you?
Schwesterchen, bist du es?
Ein Glück, ich …
¡Reiri! ¿Eres tú?
¡Reiri! ¿Eres tú?
Reiri, c’est toi ?
Sorellona! Sei tu?
Nee-chan! É você?