can you please spoil me where you read the rest?
Read 'Trace: Kasouken Houi Kenkyuuin no Tsuisou'
Of the same author they reveal that he was in love with the brother of the MC there nd was obsessed with him since there childhood and was a part of the group that r*ped his crush's gf (gf was crush's sister messed up story) he didn't r*ped her but was in the plan MC of this manga is way more twisted in his own way at end of trace he says that he didn't do all that killing for any social purpose or anything he just like seeing the reaction of people.
thankyou!!
Just got to know the whole story nd m no longer into him