If you liked
Partner
|
...then you might like
Arisa
|
Both are manga about twins, but in Arisa, the title character goes into a coma after a suicide attempt while the other twin in Partner gets kidnapped by an evil organization to become a guinea pig for their experiments. As you can tell by reading the synopses and genre tags on MAL, they are both shoujo. However, Arisa lays more heavily on mystery while Partner is more of a sci-fi manga.
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Recommended by mavirianalex