 If you liked
Bitter Virgin
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 ...then you might like
GE: Good Ending
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Both belong to the same genre (High school romance)
Both have very good artwork with a fair bit of panty flash added to it
Both have a female lead with a similar tragic past although Bitter Virgin's heroine has it much worse than Good Ending's. In both titles the male lead does whatever he can to deal with the girls tragic experience although GE doesn't do this until later (maybe I just gave away a spoiler here)