This was less edgy than I expected, based on the title I thought lots of arson was in store; in the end nobody died (maybe except for the escaping main pair who doesn't seem to intend to survive) but I like that at least one bully got what's coming to them. It was also nothing extreme, they humiliated him, he humiliated the main bully back plus a cut on the cheek.
A bit like Aku no Hana except the boy has more guts and brains and the girl has an incurable disease. Not bad for a oneshot.