Episode 2: Day of resurrection S rank requirement

Hello, I need help on what exactly "non stop clear" requirement mean for the last 100 points in this episode? I tried to go back and kill every mob in the map but it is still 0.

2.PNG

It means you have to do the entire thing in one go, without restarting from the checkpoints.

Ahhhhh, that explained a lot, I had to quit the episode mid way both runs due to work related, thanks.