When I took off the clothes of my first girlfriend... I couldn't imagine that she had pale, slim, beautiful big breasts. I was so excited that I fucked her until I ran out of libido. Riisa Kisaragi

The movie appears to revolve around the intimate relationship between Riisa Kisaragi and potentially another character, given the context provided. However, the primary focus as per the title suggests an exploration of a personal and possibly first-time experience. The dialogue in the subtitles hints at a broader storyline involving daily life interactions, shopping, dining, and socializing, but these elements seem secondary to the central premise established by the title, which emphasizes a personal discovery or encounter.