 If you liked
Aku no Hana
|
 ...then you might like
High Score Girl
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Although it may not seem like it, both manga are similar. Both manga have a main character boy, who likes one girl (oona, namakura) but not the other. In both manga, the girl who is not liked by the guy (Koharu, Saeki) ends up trying to harm the boy in some way. I enjoyed both series, but Aku no Hana is definitely for an older audience, as it deals with suicide, and other things, while High Score Girl is focused on video games and love.