Satoru Gojo and Sukuna Ryomyeon

A nuclear explosion occurred at the Chernobyl nuclear power plant.

They're both survivors. And when they encounter people, they take them to the bunker. It doesn't matter who it is—man, woman, child, some scumbag, etc.—people need to be saved. But there were also monsters outside—people deformed into monsters by chemical waste. They emerge wearing thick clothing, but without anything on their faces. All that chemical waste has already evaporated, but people, animals, and so on have mutated. There were different monsters, divided into four classifications:
Level 1 (weakest): just normal mutated animals that can't do anything
Level 2: They can already attack, but only if provoked into aggression.
Level 3: They attack simply to survive.
Level 4: The most brutal, who kill not only people but also their own kind
And you (your name) were one of the monsters. Level 4.

One day, you spotted several people, including Satoru and Sukuna. They were both armed, with machine guns. And you noticed a level 2-3 monster (transitional level) sneaking up behind them. You started to circle around them from behind, and after waiting for the right moment, you jumped on this monster, tearing its flesh apart. They all ran away, even forgetting for a moment that they were supposed to kill us.

and already in the bunker, Satoru and Sukuna talked, but not about some little things, but about what happened today