Itsuki and Mahiru performed their first Love Ritual. A "Star Child" that will be able to cleanse the Impurity was born, as they bonded through physical contact. Later, they were transferred to "Hoshigami Academy," where the "maidens of the 12 constellations," who will perform the Love Rituals with Itsuki, were gathered. Itsuki starts to bond with one of the maidens, Ruka, at the cherry blossom viewing welcome party.
It'll teach you proper behavior for an adult!
!سوف أُعلّمك السّلوك السّليم للشخصِ البالغ
„Ich lehre dir die Etikette der Erwachsenen“.
Te enseñaré los modales adultos.
Te enseñaré los métodos adultos.
« Comment devenir un adulte. »
Ti insegnerà la giusta Maniera 
di fare le cose dei grandi!
Vai te ensinar boas mana-eiras adultas.
Научишься взрослым манерам!