Gyaru Shinkan wa Rizare ga Darui

To defeat the Demon King, a hero continues to fight alone over and over again. Even though he dies countless times, he still pushes forward recklessly.
In truth, he only does it because he wants to meet and spend time talking one-on-one with a gyaru priestess who can bring him back to life. Even dying doesn’t matter to him, as long as he can see her again.