Defense Devil is a manga about Dochu, a demon who acts as a defense attorney in Hell's courtroom, defending humans accused of sin to prevent their souls from being sent to the abyss. However, he secretly steals their "sin crystals" to later use them to overthrow the Demon King. The story mixes supernatural court battles with action and comedy. Readers enjoy it for its clever premise, fast-paced plot, quirky characters, and the twist on traditional devil mythology, as well as the moral dilemmas explored in each case.