[Demon Slayer] Three Hundred Years After Your Death

Suyue, a shrine maiden who served an evil god, was summoned and awakened during the Warring States period. By chance, she met ten-year-old Yoriichi Tsugikuni. She promised to meet him again many years later, then went to fulfill her duties as a shrine maiden.

...By the time she came to her senses, Yoriichi had already lived out his life and died.

Suyue made the blasphemous decision to resurrect Yoriichi Tsugikuni.

*

There are a few crossover elements from Onmyoji and Touken Ranbu. You don't need to have read or played them to follow along.

Theme: Take responsibility for your own affairs