Lucia finds herself attracted to Touya after he resolved the coup d'etat at the Regulus Empire. Picking up on that, Yumina proposes that they welcome Lucia in as Touya's fifth fiancee.
it'll cut way down on 
the materials we need.
فذلك سيختذل المواد الّتي نحتاجها كثيراً
brauchen wir nicht
so viele neue Materialien.
on aura besoin
de moins de matériaux.
avremo molti meno materiali da recuperare!
deve reduzir os materiais
que precisamos.
то обеспечим себе большинство материалов!