Horizon (AKIYAMA Shiten)

Mieko, a woman in in her late twenties, exhausted by her busy everyday life, catches a glimpse of students enjoying their youth and suddenly recalls her own younger days. Driven by alcohol, she puts on that sailor uniform and ventures out to a park in the middle of the night. There, she runs into an impossibly perfect, stunningly handsome young man. (Source: Shonen Gahosha, translated)