Saikin, Imouto no Yousu ga Chotto Okashiinda ga Temporada 1 Episódio 10

After fighting over a trivial matter, Hiyori throws a fit and leaves. Mitsuki even enjoys the chance to finally have some time alone to herself for the first time in a while. However, during her dinner with Yuuya, she notices her own heart aching at his little behaviors.