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.
you have no choice but to 
perform a Double Love Ritual.
.لا تملك خيارًا عدا ممارسة طقوس الحبّ المزدوج
bleibt dir keine andere Wahl,
als ein Doppel-Liebesritual zu vollziehen.
no hay más opción
que hacer el Doble Ritual de Amor.
no hay más alternativa
que hacer el Doble Ritual de Amor.
tu vas devoir procéder
à un double rituel de l’amour.
non hai altra scelta che
eseguire un Doppio Rito d'Amore.
parece não haver opção além
do Ritual Duplo dos Amantes.
тебе придётся провести 
Двойной Любовный ритуал.