Responses
The 10 years I loved u the most.
Its so sad
Also this one is so good, one of the side couple (includes in the story side story fully given) No spoilers:
https://www.mangago.me/read-manga/somewhere_in_time/

Any recs with terminally-ill/ time-limited MCs that actually die at the end? Like, they don't cure it even if they try. Any genre is fine