In Norowareta Uchu, all living beings emanate an energy called Cursed Energy, which arises from negative emotions that naturally flow throughout the head. Normal creatures cannot control this flow in their heads. as a result, they continuously lose Cursed Energy that gives birth to Atama, a race of spiritual beings whose primary desire is to bring harm to all creatures. These are known as Norowareta Atama "The Cursed Heads".
Sentoki are people who control the flow of Cursed Energy in their entire bodies which allows them to limit its release. High-ranking Sentoki and Atama can refine this energy and use it to perform Cursed Techniques, which tend to be unique to the user or their family and Skin Colors.
Each Sentoki (also Majutsu-Shi & Akachan if one of the ancestors is an Sentoki) have a rank to assess their skill level ascending from Rank 4 to Special Rank. Each Sentoki (also Majutsu-Shi & Akachan) generally start at Rank 4 upon joining the Noroi no Akademi, but this depends on experience and minting process.
Atama and Akachan if one of the ancestors is an Atama are ranked on a similar scale but not exact. The higher-ups can be particular when it comes to ranking Atama. The distinct difference between a rank 1 and a rank 2 Atama is whether or not it is capable of using Norowareta Tekunikku “Cursed Techniques” 呪われたテクニック.
Each Sentoki (also Majutsu-Shi & Akachan) are expected to take on missions involving Atama of the same level. A Rank 2 Sentoki (also Majutsu-Shi & Akachan) should be able to defeat a Rank 2 Atama because their skill level is closer to the strength of a Rank 1 Atama.
Norowareta Dogu are also categorized from rank 1 to Special based on power and potency. The higher the grade, the greater advantage in battle. All Special Rank Norowareta Dogu are imbued with a Norowareta Tekunikku.