In order to defeat Impurities that turned out to be far stronger than expected, Itsuki is pressured to perform a "Double Love Ritual" with two maidens at the same time. It is said to produce powerful Star Children, but it has never been performed before. Itsuki steps into uncharted territory, following the lead of onee-san maidens Reone and Falun.
It was just a silly promise
 between two kids.
.كان مجرّد وعدٍ سخيف بين طفلين
Das war nur ein lächerliches
Versprechen zwischen zwei Kindern.
Solo era una promesa tonta entre niños.
Solo era una promesa tonta entre niños.
On était des enfants,
c’était rien de sérieux.
Era solo una stupida promessa
fatta da due bambini!
Aquilo foi só uma promessa
inocente entre crianças.
Всего лишь глупое детское обещание.