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.
Granvania has what they 
call hot springs in Sola.
.لدى غرانفانيا ما يُدعى بالينابيع السّاخنة في سولا
Granvania tiene aguas termales
como las de Sola.
Granvania tiene aguas termales
como las de Sola.
À Granvania, on a l’équivalent
de vos sources chaudes.
A Granvania ci sono quelle che
voi di Sola chiamate "terme".
Em Granvania existe o que chamam
de águas termais em Sola.
В Гранвании есть свои горячие источники.