@Svarna People aren't saying that because self-evident truths need not be declared.
Believe me, I translated
Revenge Classroom. This is forgettable revenge porn at its finest, so edgy it should come with bandages and a caution warning.
Evil laughter isn't a precondition. Any trippy, evil vs evil, no-shades-of-grey-or-redeeming-traits vendetta story is edgy by definition. Some cater for kids who would like to be avenging geniuses and masterminds; others, like this one, cater to people who like overpowered rampages and enjoy seeing bastards grovel for their lives in despair. These could be definitions 1 and 2 in a dictionary entry for Edgelord, though definition 1 is probably the more colourful one.