A half-beast mercenary who wants to be human guards a witch who doesn't understand humanity. Zero asks the dumbest questions because she's literally never seen the world before, and his answers, delivered with exhausted patience, become the real story. The journey toward her grimoire is a cover for what actually matters: watching someone learn to care, and someone learn to be cared for.
Zero has spent her entire life locked away in a tower, knowing nothing of the world beyond her walls. When a half-beast mercenary stumbles upon her, she makes him an offer: become her bodyguard on a dangerous expedition, and she'll use her forbidden magic to make him fully human. The catch is that Zero isn't searching for a cure or treasure. She's hunting for her own grimoire, a tome so powerful it could unmake civilization itself. As they travel through a land where magic has been forgotten and witches are hunted as monsters, an uneasy partnership forms between them. Zero's naivety about everyday life clashes with the mercenary's cynicism, but their shared goals keep them moving forward. The real problem surfaces gradually: Zero doesn't remember why her book was hidden away, and as they get closer to finding it, both of them question whether unleashing that power is worth the cost. This is a fantasy adventure that balances action with genuine character growth, mixing humor against a backdrop of real danger and moral weight.