 If you liked
Jimoto ni Kaettekitara Osananajimi ga Kowareteta
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 ...then you might like
Rii-chan
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They are 95% the same story. Guy comes home to find his female childhood bestfriend is a total mental wreck. The key here is that 5% difference really does make the story feel fresh and different. Both are very much worth a read if you've read and enjoyed one or the other.