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's a ritual where you have 
two partners at once!
!إنّها طقوسٌ حيث تحظى بشريكتين في آنٍ واحد
Es ist eine Zeremonie, in der du es
zwei Partnerinnen simultan besorgst!
¡Un ritual con dos compañeras a la vez!
¡Un ritual con dos compañeras a la vez!

C’est un rituel
avec deux Prêtresses.
È un rito che coinvolge due Sacerdotesse.
É um ritual onde você fica com
duas parceiras ao mesmo tempo.
У тебя будет сразу две партнёрши!