"Tougen Anki" is a supernatural action anime set in a world where humans coexist with oni, powerful demonic beings with unique abilities. The story centers on Shiki Ichinose, a young man who discovers he is a descendant of the legendary oni slayer, Minamoto no Yorimitsu. After his adoptive father is killed by oni, Shiki learns of his heritage and the existence of a hidden society dedicated to combating these malevolent entities. He inherits the ability to summon and wield the powers of oni, a rare and dangerous skill that places him at the center of a conflict between humans and oni.

Shiki joins the Genji Clan, an organization of oni slayers, where he trains to harness his newfound abilities. Alongside allies like Chikage Ushiwaka, a skilled swordswoman, and Kintaro, a fellow oni slayer with a mysterious past, Shiki faces numerous challenges as he battles powerful oni and uncovers the truth about his lineage. The narrative explores themes of identity, loyalty, and the moral complexities of wielding power, as Shiki grapples with the dual nature of his abilities—both a curse and a weapon.

The plot delves into the political and social tensions between humans and oni, as well as the internal struggles within the Genji Clan. Shiki’s journey is marked by encounters with formidable adversaries, including the enigmatic oni leader, who seeks to exploit his powers for their own agenda. As the story progresses, Shiki must confront his own fears and doubts while striving to protect those he cares about. The series balances intense action sequences with moments of introspection, creating a dynamic narrative that keeps viewers engaged. Through its exploration of Shiki’s growth and the intricate world-building, "Tougen Anki" offers a compelling tale of supernatural conflict and personal discovery.