 If you liked
Josee to Tora to Sakana-tachi
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 ...then you might like
Kimi wo Aishita Hitori no Boku e
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Both animes follow a romantic relationship with the difference that in Kimi wo Aishita Hitori no Boku e, the whole plot is a lot more complex, while in Josee to Tora to Sakana-tachi the whole romance plot story is a lot more chill and easier to consume. Both shows are very emotional and would leave you teary eyed at least once during the watch.
If you want a more complex romance story go with Kimi wo Aishita Hitori no Boku e
If you want an easier to consume but still very interesting and sweet romantic story, go with Josee to Tora to Sakan-tachi