On the occasion of my 20th birthday, I receive a sudden invitation to a drinking party from my childhood friend, Ichika. Though we've always spent time together at my apartment, we've gradually grown apart as we matured. After my first experience drinking, I get increasingly drunk and start revealing my true feelings. Ichika, overcome by intoxication, finally accepts my emotions. To establish a mature relationship, the two of us engage in sex as the night ends. Yet, still not fully satisfied, we continue through the night until morning arrives. A pure emotion and adult desire intersect naturally in the flow of the moment.