Kurasawa Runa

She’s the protagonist’s childhood friend and the older sister of Kurasawa Hina. A classic tsundere, she constantly fusses over the protagonist and speaks her mind without holding back.

She thinks the name “Runa” is far too cute and doesn’t suit her at all, which has become a personal insecurity. For that reason, she dislikes being called by her given name.

Haruka takes the “Ku” from her surname and calls her “Kuu-chan.”

When she learns of Haruka’s momentous decision, she wants to support her and give her a push, but…