Yuta starts to get worried about Saki and asks Akiko for advice. Akiko tells him that he should take Saki out for a break now and then, even if he has to insist. Later, when Yuta tries to talk to Saki about the pool trip with Maaya, Saki reacts harshly.
Rules are one thing. 
But in reality, things change.
القواعد مهمّة. لكن في الحقيقة، تتغيّر الأمور
Das sind die Regeln. Unsere Abmachung
wird den Umständen angepasst.
Las reglas son las que son,
pero la realidad es otra.
Las reglas son las que son,
pero la realidad es otra.
Il faut suivre les règles,
mais avec discernement.
Le regole vanno rispettate.
Regras são uma coisa,
a realidade é outra.
Договор — это одно, 
а в реальности всё меняется.