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.
All that's left is to improve 
his technique for the Love Ritual!
!بقيَ فقط أن يطوّر مهارته لأجل طقوس الحب
Solo queda mejorar su técnica
en el Ritual de Amor.
Solo debe mejorar su técnica
en el Ritual de Amor.
Il n’a plus qu’à améliorer
sa technique au rituel.
Ora non resta che migliorare
la parte tecnica del Rito d'Amore!
Com isso, o que resta melhorar são
suas técnicas no Ritual dos Amantes!
Осталось улучшить его навыки 
для Любовного ритуала!