 If you liked
Kimi no Na wa.
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 ...then you might like
Kimi to, Nami ni Noretara
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- both characters meet each other and are happy for awhile, then one of them disappears and one of them have to find the other.
- lots of challenges to find the other person.
I don't wanna say much since I know if I do i'll spoil a lot but, Ride your wave has some similarities to Your name that I think are very alike. One person disappears and the main character has to go through challenges to find him, or get over him.