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?!
Last time, Yasumi-chan and I 
spent the whole night talking.
في آخر مرّة، قضينا أنا وياسومي-تشان
.اللّيل بطوله نتحدّث
Letztes Mal haben Yasumi-chan und ich
uns die ganze Nacht unterhalten.
La vez pasada hablamos
toda la noche, ¿no, Yasumi?
L’autre fois, avec Yasumi,
on a papoté toute la nuit.
Da última vez, eu e a Yasumi-chan
passamos a noite inteira conversando.
В прошлый раз мы с Ясуми
 всю ночь проболтали.