I was with my childhood friend "Ichika," who lived in the same building. We were inseparable since we were little. Although we drifted apart as we grew up, Ichika suddenly suggested we drink together for my 20th birthday. Since it was my first time drinking, I didn't know how to handle it and we both ended up completely drunk... Then I couldn't help but confess my true feelings. I don't know if Ichika was drunk too, but she accepted. And then, as adults, we were unsatisfied with just one sexual encounter, and that's how we ended up doing it until dawn...