Trust me not even a little bit of romance is in these mangas, it is safe here :D I don't even do one-sided crushes. If there is any in any of these books, please tell me and I will remove it. If there is it will only be for your comfort, so you don't have to waste time reading and finding it our yourselves.
Really good, there is a one sided crush so read at your own risk. I doubt it would go anywhere seeing as the MC is emotionless and doesn't react to anything. He literally just wants to die, but can't.
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I'm pretty sure there's romance in poison dragon:asura. They even did the hanky panky.
Just to let you know, Killer Killer has romance. Or at least, I believe it counts as romance.
shit bro thanks for letting me know. sorry I'm just now seeing this, I don't get notifications for some reason