Honestly, I'm not normally about action battle manga but... few things piss me off worse than how much teachers enable bullies and refuse to believe the extremes bullies can put people through. Like this manga's depiction of it is extreme, but there are a LOT of actual Akaris out there.
It is indeed ironic that pursuing his own honor code has this demon dispensing some overdue justice.
This "... to accomplish what it must accomplish, and die" is ok ig. But isn't the guy's goal too low/shallow? At least the guy can make multiple of itself to further accomplish the goal. And then it spirals lol.
Quick gg search yields "watakushi, わたくし, 私, very formal. The most formal personal pronoun [...]" "However, in modern student books, such a pronoun has been withdrawn from use.". Isn't this old guy's speech.