Review Detail of mithun in Astral Pet Store

I a huge fan of this book until chapter 380.from that chapter mc act like more shittier than most villians.mcs sister is one of the finelist of match. because she was going to lose match she tried to suicide to make her opponent to lose qualifications. it infuriated her opponent (also girl) so she dragg MC's sister by holding hair and threatened to destroy her clothes. mc infuriated because this(normal). he cut her hand . threatened to kill her and followers ( members of secret group which fight against demon invasion and they were pretty famous people). govt employees tried to stop fighting because there are alot of normal people there and they will die if fight start and both mc and opponent has strong background.but mc even killed him just because his intervention.and he also killed girls followers including maid who tried to protect her master but didn't killed main culprit because he wants to fight the association so he need bait. I don't know where commonsense went..I read alot of anti-hero mc stories..but this type of mc are rare even among them...( I read one novel mc annihilate a clan just because a silk pant comments on mc s one of the harrem member)