Kimi no Na wa., ReLIFE: Kanketsu-hen Recommendations
Though the situation is different for both anime, both contain similar vibes that allows me to make a recommendation. Embracing the moment to make the present worthwhile, in a desperate attempt to not forget. This is perhaps the most spoiler free thing I can say regarding these two anime.
If you have watched one, you will most definitely enjoy the other.
(Tip for maximum feels: Watch s1 of ReLIFE)
Even though the story aren't similar, both anime share some things in common (even to the smallest details) that will blow your mind.
Both of them deal with remembering the name of your soul mate that you forgot, one with ReLife program, the other with the main character which is in a state of oblivion about the name of the girl he love.
There is also a lot more of similitudes between these 2 animes but I can't say more because it would be spoiler for both so I will stop there.
The feeling of losing something. Something that you can't quite recall, but you know that it's somewhere out there. Something, or someone... both of these anime capture that emotion in a similar fashion, and if you want to continue the feels train, I would suggest watching this too.