Chinami and Tsukasa played at Chosokabe apartment, when something reminded Tsukasa of what she have seen. These memories evoked complicated emotions, so she decides to ask Chinami, what she knew about adult things. Flustered and confused, Chinami had to try to stop her friend's thoughts.
Unfortunately, she fails, and curiosity doesn't leave Tsukasa even for a second. Few minutes after, Chika gets back home, and Chinami uses her wizard superpowers in another attempt to change Tsukasa's mind. Although, it doesn't help either, so Tsukasa seeks Chika's consult on the subject. Chika explains it vaguely but simple, like an older sister to a smaller, and advices to address Tsubasa.
Chinami is not satisfied, to say the least, but in the end they return to what Chika said about Tsubasa, which makes Tsukasa share her thoughts about her mother and their relationship. This uplifts Tsukasa's spirit and leaves her in a good mood!