Chainsaw Sword from the Start: As the Flame Hashira, I Burned the World's Demons to Ash

[Invincible, single heroine, paranormal horror, twists, neurotic, Warhammer 40,000, Demon Slayer] Reborn for a new life, Tang Ying becomes a landlord and a university teacher. His life should have gone smoothly, but who could have guessed the world would change overnight? Spiritual qi revival brings defenders of the homeland, secret demon slayers, and people who prey on the world. Evil spirits also roam the night. Tang Ying is a severe chuunibyou, reborn in a world without Demon Slayer or Warhammer 40,000, a place with few anime or games. From the start, he's attacked by bloody handprints. Just as Tang Ying is about to die, he shouts, “The Emperor's will shines like a torch, annihilating all specters!” Unexpectedly, this activates the Myriad Worlds Enhancement System. He shouts the Emperor's declaration and powers up dual-wielded chainswords: dual-wielded chainswords of materialism. He cries, “Even if my soul is utterly destroyed, I will cut down every last demon!” and unlocks the Flame Breathing style from Demon Slayer. At the very end, the Western evil gods prepare to invade the land of Huaguo. Waiting for them is a hodgepodge mecha with Ultraman on its left shoulder, EVA Godzilla on its right, and BT at its core.