
It’s about this pink haired guy (forgot his name) and he gets held captive by this gang of some sort the seme has black hair and their morals for keeping him hostage have something to do with the pink haired guys sister. (sorry for the inconvenience ╥﹏╥)
I don’t think this is it but ‘Karasugaoka Don't be shy!!’ has something similiar. Though, both of them are leaders of their own gang (one pink haired and the other black haired) and in the last few chap(s)
(spoiler?)
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the black haired guy’s sister gets kidnapped along w/ pink hair guy
can’t believe it’s over now, four years following along with this manhwa and it’s safe to say it’s my favourite, so much complexity between both of them and even despite the multiple health altercations the author had to face she still pulled through and delivered a really beautiful story 10/10