Based on the conversation on the show, the two of them have a sleepover at Chika's fancy house. Yumiko's happy to see Chika enjoy the dinner she cooked. Then for some reason, they end up taking a bath together. How did it come to this?!
But we usually spend so much time together, 
people ask if we're a couple.
يسألنا النّاس إن كنّا نتواعد لأنّنا نقضي
.الكثير من الوقت معًا في العادة
Wir verbringen so viel Zeit miteinander,
dass andere oft denken, wir wären zusammen.
Usualmente nos vemos tanto
que la gente cree que somos pareja.
Pasamos tanto tiempo juntas,
que nos preguntan que si somos pareja.
On traîne tellement ensemble
que certains nous croient en couple.
Ci incontriamo così spesso che di solito
ci chiedono se siamo una coppia!
Mas normalmente a gente se vê
tanto que somos quase um casal.
Мы вместе больше, чем некоторые парочки.