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I don't know I watched it RAW sorry :/ try dramanice and about those bullies especially the ring leader.... hmm you do will get revenge but is it satisfying...? Depends on the person, some people will definitely sympathize with him. Ah it's not too dark or depressing as Oyasumi punpun was but it will get more fucked up like Oyasumi punpun.
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A deep and depressing seinen manga: http://www.mangago.zone/read-manga/oyasumi_punpun/
It has some cute bromance/possible gay romance too between side characters, if you're into BL.
What I read: Bokutachi ga Yarimashita
What I expect: Some heartwarming atonement story
What I got: Some depressing and fucked up story à la Oyasumi fucking Punpun