Minase Taki, a green-eyed teenager with short brown hair, stumbles upon an ancient grimoire in his school’s basement, igniting a spiral of dark magic experimentation. Initially manipulating romantic outcomes for others, he soon succumbs to selfish desires, wielding spells to control individuals—most tragically, the student council president, whom he entraps in a destructive obsession that fractures her sanity.

Caught between a manipulative school nurse exploiting his power and a cautious mentor urging restraint, Taki faces escalating ethical dilemmas, torn between self-preservation and the collateral damage of his choices. Interactive narratives diverge, permitting either hedonistic indulgence or tentative redemption.

Domestic life introduces a stepsister cousin sharing his home, her laid-back presence contrasting his secret turmoil yet remaining distant from the supernatural fray.

As dependence on the grimoire deepens, pivotal confrontations force him to either surrender to corrupting forces or resist their pull. Consequences ripple outward: psychological ruin for his victims, potential self-destruction, or fleeting atonement, varying across adaptations.

Themes of temptation, moral grayness, and power’s corrosive allure intertwine through clashes with secondary figures mirroring his struggles. Taki’s journey dissects human fragility and the relentless cycle of desire, framing him as both perpetrator and pawn in a broader exploration of ambition’s shadows.