Last updated: 2026-06-03

Contract Fundamentals

Devil contracts are how humans access devil power. A human offers something of value to a devil in exchange for power. The cost is always meaningful: body parts, lifespan, or senses. The devil determines the price based on the power's value, and contracts are binding and automatic.

Price Determination

Cost scales with power. Simple contracts like Aki's Fox Devil agreement require modest payment. The Curse Devil's guaranteed kill costs significant lifespan. Extreme contracts like Himeno's total body sacrifice result in death. The economics of contracts reflect the brutal calculus of the series' world.

Contract Strategies

Skilled hunters maintain multiple contracts for flexibility. Aki's portfolio (Fox, Curse, Future Devil) covers different combat roles. The key is diversifying costs to avoid overpaying. Some exploit loopholes: the Future Devil accepted Aki's contract for free, wanting to experience his tragic death as entertainment.