Review Detail of UniVerseLessOne in Assassination Through the Netherworld

Welp, the first chapter was intense enough as it is. He had done so much for the world yet as he is supposed to have met his end, a new and much dangerous world awaited him. Anyhows, I could somehow connect Stain and the Octopus teacher from Assasination classroom to the MC. Octopus teacher because of his Top Assassin origin story while Stain due to hid extreme ways of purging the stains of the world.