Naruto: True to My Word, I Became a Ninjutsu Master

He traveled through the Hokage and became the Genin Kamiya Yao at the bottom of Konoha. He has no blood inheritance, no background, and can't even learn ninjutsu - the third ninja war is about to begin. Kamiya Yoshi, who was just a genin, felt that he would definitely not survive the war. But at this moment, he awakened to the yanjujutsu system: whatever ninjutsu he recited, he could release any ninjutsu. Rasengan, Chidori, Amaterasu, Shinra Tenzheng... There was nothing he couldn't shout out, there was nothing he couldn't release. The enemy ninja hadn't made a move yet, but he was frightened just by his words. "Come on, Tsuchikage, let's face off and see whose dust escape is better." However, Kamiya Yao soon discovered a fatal problem—— He has blue bars. Two minutes of pretense, two hours of exhaustion. After playing Amaterasu, he leaned against the wall to catch his breath for a long time; after shouting out the Shinra Tensei, he couldn't even hold his rice bowl. He obviously has invincible skills, but he is stuck with the blue bar. As a result, his journey in the ninja world changed from "how to release more ninjutsu" to - how to accumulate more mana. "The day I accumulate enough blue bars, I, Kamiya Yao, will stand on the top of the ninja world and be immortal forever!"