I`m actually surprised that no one recommended Hatsukoi yet.
For one, while watching Long Vacation I found myself thinking of Hatsukoi scenes even though the plot isn`t the same at all.

The story revolves around two students who fall in love at first sight kinda. Experiencing first love, then later on complications arise which separates them. After 20 years, meeting again their story continues...
While it`s a modern production, the 80s and 90s palettes are there visually, which give it a nostalgic vibe, just as Long Vacation does.