I'm Doing Jujutsu Kaisen in the Ninja World

Introduction: Greetings, I am in the Ninja World, just out of the hospital bed! Surrounded by a group of fanatical black-robed people, and a gray-haired guy named Hidan is laughing wildly at me. Just because I am the second 'lucky one' to successfully 'survive' in this divine selection ceremony and obtain 【Immortal Body】. Akagi Shinji feels a bit numb... And what makes him even more depressed is that, after being transformed, his body only has chakra, but can no longer cultivate any ninjutsu. This means he will become the first immortal waste ninja! But the activation of a bizarre system has brought completely new changes to his life. Can't learn ninjutsu? Small problem! There are many wonderful sorceries here for you to choose from! Crimson Blood Manipulation, Straw Doll Technique, Ten Shadows Technique... you name it. Wait a minute! Why is there also 【Cursed Wind Hole】?! Is this also considered sorcery?!!! Forget it, whatever, domain expansion, unlimited void! (Newbie new book, please give more guidance ~)