When summoned by Aki the Curse Devil manifests as a large two-headed skeleton with horns on its monstrous skulls and a large distended ribcage.
The Curse Devil's personality is currently unknown.
Aki considers using the Curse Devil's sword to defeat the Eternity Devil but Himeno restrains him with the Ghost Devil's arm.
During his battle against the Katana Man, Aki pulled out his Curse Spike to pierce Katana Man's body three times. This trigger served to summon the Curse Devil on Aki's behalf who manifested behind the Katana Man and picked him up before biting him and killing him.
Aki later assk the Curse Devil has much life span he has left after using the Curse Devil's power, and the Curse Devil states that he has two years remaining.
Tolka's master uses a nail to stab Denji three times without him noticing. She explains her contract with the Curse Devil to her apprentice and entrusts the fourth and final stab for him to perform as a test. If he succeeds then she will reveal her other devil contracts to him.
Blood Consumption: As a devil, the Curse Devil should be able to restore its health by consuming blood.
Revival: As a devil, the Curse Devil should revive in Hell after being killed effectively making it immortal.
|Katana Man arc|
|25. Ghost, Snake, Chainsaw||Absent|
|26. The Gun is Mightier||Absent|
|27. From Kyoto||Absent|
|28. Secrets & Lies||Absent|
|29. Perfect Score||Appears|
|30. Bruised & Battered||Absent|
|31. The Future Rules||Absent|
|32. Over and Over Again||Absent|
|33. Mission Start||Absent|
|34. Full Team||Absent|
|36. Katana vs. Chainsaw||Absent|
|37. Train, Head, Chainsaw||Absent|
|38. Easy Revenge!||Absent|
|International Assassins arc|
|53. In a Dream||Absent|
|54. Let's Go to Enoshima||Absent|
|55. Let's Go||Absent|
|56. A Curse and a First||Mentioned|
|58. Kurose Yutaro||Absent|
|Devils||Angel Devil • Bat Devil • Chainsaw Devil • Curse Devil • Doll Devil • Eternity Devil • Fox Devil • Future Devil • Ghost Devil • Gun Devil • Leech Devil • Muscle Devil • Sea Cucumber Devil • Skin Devil • Snake Devil • Spider Devil • Stone Devil • Tomato Devil • Typhoon Devil • Zombie Devil|
|Fiends||Beam • Power • Violence Fiend|
|Hybrids||Denji • Katana Man • Reze|