The original comic created by Kenta Shinohara. It was serialized online via Shonen Jump Plus website and app.
On Netflix, the first and twelfth episode being 47 minutes long have been both split into two parts a and b. Part a of first episode is 21 minutes long and part b, 26 minutes long. Similarly, part a of episode 12 is 23 minutes long while part b is 24 minutes long.