Umi scored lead roles for them in a romance by an up-and-coming director. Filming will take several months in another country. Kazuya will be blissfully happy for her, and praise her lavishly until she gets angry (which will confuse him).
Ruka is waiting when they get back, worried because he called out sick. (He was too scared they would say no if he asked.) Kazuya will be even more confused when Chizuru says nothing and just goes in her apartment.
When he tells her about it, Ruka won't want to -- but her conscience will make her break it to him what this means.