 If you liked
Kono Danshi, Ningyo Hiroimashita.
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 ...then you might like
Doukyuusei
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This OVA is also shounen ai! It has a male protagonist who, similar to Sajou Rihito, is rather lonesome and troubled, especially after losing his beloved grandfather. In his state of grief, he goes to the ocean and “falls” into the water just as he remembers that he can’t swim. Miraculously, he is saved by a beautiful merman, who moves in with the boy and continues to save him in all sorts of ways…
What this OVA and Doukyuusei especially have in common are their unique, artistic animation styles, and their utterly gripping and moving developments in both romance and drama.
Mid-length OVAs.
Dreamy atmosphere.
Beautiful, stylized animation.
A bit of drama but mostly cuteness.
A romance that doesn't just repeat shounen ai clichés.
Deal with one main character being scared of letting people close and how the other one's love changes that.
The main difference is that Kono Danshi, Ningyo Hiroimashita is fantasy while Doukyuusei takes place in a school.