
Big spoilers!!
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Though we had some little hints before , biggest first reveal about their relationship happened in ch 257. Since it is comedy manga of course their plot also have gags but they actually have proper plot development, very slow-burn tho. We still don't know if it is going to be romance or bromance but both of them admitted they were each other's first love -they thought other one was girl- , demon king bothered and stressed by it a lot. Both because his first love was a man and because he was his enemy. But hero wasn't bothered by the fact that his first love was a boy, when he learned.

Thank you for the spoiler—ik it’s comedy so it wasn’t like I was expecting massive development but I’m glad it’s not just some throwaway gag one time and forget completely such sometime jokes like “omg haha gay” kinda throws me off lol.
Do u happen to remember which chapter both characters found out they’re each other first crush? Or had that not happen yet
It’s been ages since I finish the anime but never got to the manga haha I randomly went back to the series and saw some spoiler about the demon king and hero. Can someone spoil me does that ever get developed or is that a throwaway gag; Id yes—around what chapter ?