[Demon Slayer] Tanjiro the Demon

The Upper Rank Demons among the Twelve Kizuki are immensely powerful, and have always been a force the Demon Slayer Corps fears. What the world doesn't know is that above Upper Rank One, there's another demon whom Muzan has given the title of Zero: Upper Rank Zero, Tanjiro Kamado. There's no information about him, not even a description of his appearance. The Demon Slayer Corps even believes this demon doesn't exist at all. Muzan Kibutsuji stood at the edge of a cliff, gazing down at the town. A flash of madness appeared in his eyes. "Go enjoy the humans you long to obsess over, my greatest creation, Tanjiro..." Premise: 1. Muzan Kibutsuji placed a suggestion in Tanjiro's mind. He forgot all his memories and became a demon. 2. Tanjiro is still a little angel. 3. Tanjiro's left eye is marked with the character for zero. 4. Anime featured: "Demon Slayer," "Nura: Rise of the Yokai Clan," "Onmyoji," and "Hozuki's Coolheadedness." Theme: None