Danmachi : Shinigami

When a survivor from a post-apocalyptic world, living long after civilization's fall, stumbles upon 'study materials' left by his predecessors and unknowingly becomes an "otaku," he is exiled from his world and transported to the world of DanMachi. 'Seriously, who the hell is Uchiha Sasuke?!' 'Because of that guy, I'm now stuck being called Himura Battousai!' The Mc will have a shinigami powers from bleach as his magic and he can forge Zanpakuto! Timeline Starts before the Orario great war! — Description from novelcodex.org