Set in a modern Japan where
the descendants of two mythological bloodlines wage a secret, brutal war, *Tougen Anki* follows Shiki Ichinose, a rebellious yet deeply compassionate high schooler living with his
adoptive father, Mudan. Shiki’s life shatters on his sixteenth birthday when a mysterious, blood-soaked man named Tasuku Sen’ya attacks them. Tasuku reveals a shocking truth: Shiki is actually the son of an Oni, carrying the tainted blood of the ancient horned race, and Mudan is a Momotaro agent tasked with assassinating him.Driven by instinct and newfound monstrous powers that manifest as razor-sharp claws and fiery blood, Shiki barely survives the ambush, but watches helplessly as Mudan is seemingly killed. Grief-stricken and confused, Shiki is thrust into a hidden underworld. He is rescued and brought to the Rakshasa Academy, a secret sanctuary and training ground for Oni. There, he meets fellow teenage outcasts struggling with their demonic heritage. Shiki learns that the Momotaro Agency—hailed publicly as heroes of justice—are actually ruthless executioners dedicated to the total eradication of the Oni race, viewing them as subhuman monsters.Motivated by a burning desire for revenge against the Momotaro who murdered his adoptive father and seeking to understand his own terrifying abilities, Shiki resolves to become strong. He undergoes grueling, often life-threatening training alongside his volatile rival, Naito Mudano, an elite and eccentric Oni captain. As Shiki hones his blood-manipulation combat style, the conflict between the two factions escalates dramatically. The Momotaro Agency launches targeted strikes against Oni strongholds, forcing Shiki and his comrades onto the front lines of a generational war.Throughout the chaos, Shiki grapples with the dark temptations of his Oni bloodline, fearing he will lose his humanity and become the mindless monster the Momotaro claim all Oni are. Dramatic confrontations reveal deep-seated betrayals, tragic backstories, and the morally gray reality of a conflict where neither side is entirely innocent. Shiki forms fierce bonds with his fellow academy students, finding a true family among the outcasts. Ultimately, the narrative shifts into an all-out war for survival, with Shiki stepping up as a key catalyst in the eternal struggle between Oni and Momotaro. Embracing his horns and his fiery destiny, he vows to carve out a future where his kind can finally live in peace, setting the stage for a bloody, high-stakes battle that will determine the fate of both worlds.