I NEED ROMANCE ANIMEEE SUGGESTIONS

Recently, I have finished the manga called "Last Three Days of Happiness," and it was actually very great, with a good plot twist and character development that was brought together in just 16 chapters. Now I want something similar: a short anime with actual good plotting, not an average high schooler, which always ends with a firework. Something unique, and don't forget to write why you would suggest that anime to me. Cya