Now that I think about it, I may have been interested in her since the first time I was introduced to her (Akane). When I learned that today was my sister's (Mayu's) birthday, I couldn't stand still, and before I knew it, I was in front of my sister's house. When I rang the chime and there was no response, I was thinking of leaving, but the older sister came out. Ah, I really like her. Her thoughts became confirmed.