 If you liked
Koroshi Ai
|
 ...then you might like
Raise wa Tanin ga Ii
|
Both stories revolve around criminal organizations, sport dark and quirky humor and have a capable female lead who becomes the target of obsessive love for a creepy, always-smiling crazy-ass male lead. Sinister and cute.
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Recommended by Trivialmadness
Both have bloodthirsty, dangerous guys that kill people as their job, and are unperturbed by blood and death. The males in both mangas are also the ones to initially show actual interest in the girls, whereas the girls kinda ignore and reject the males' advances, evidently because of their dislike of what the guys do.