Demon Slayer/fatehide and Seek

There is a bone-eating well in the courtyard of your dojo, which connects the Taisho era to modern times. Your mother was an amazing knife maker. His father married into his wife and is now the operator of a swordsmanship dojo. And your great-grandfather was a gentle and simple swordsman and charcoal seller, but he died young. As long as you can remember, you have followed your father to learn the God of Fire Kagura, and used the swords left by your ancestors to fight against the evil spirits who came to the modern age through the Bone-eating Well to prevent them from harming ordinary people—— You are a well-deserved swordsman genius and the signature of the dojo. Since you first picked up the sword, there has been no opponent for you in this world. "Why can't Dad learn Kagura, the God of Fire?" As a young child, you touched the flaming markings on your forehead and asked doubtfully. Your father laughed, stroked your hair, and said, "Those who can learn Kagura, the God of Fire, will bring punishment to evil spirits." The neighbor Shirou Emiya thought for a while and concluded: "In other words, will Chinomiya-san become a partner of justice?" Hmm... Partners of justice? I haven't considered it. ——Lightning protection is as follows—— 1. Can be substituted, surname Qian Gong, self-named, written in the second person 2. Mary Sue from Demon Slayer Pattern Transparent He Dao three-piece set. Patterns are born and have no impact on lifespan. 3. It will travel between modern times and the Taisho era. The timeline starts from Fate Zero. A super strong species who will fight for whoever follows the line, and the ancestral family bond. 4. Yuanyi is Bai Yueguang's best friend. Saber and Yuanyi are on the same line (origin line). They are written completely as they please and updated as they please. Some lines may have different branch endings. Please click "cross" if you don't like it. 5. The ending line is divided into parallel worlds, and the options to make the distinction will be similar to "Go to the Taisho Era" and "Stay in the modern era", but no matter which line you take, Ichiro will not die, and you will definitely fight Ichigo. Intention: Turn everything around!