The Sovereign of Senjinkai. An incredibly skilled assassin who commands respect from ten million subordinates. He is the absolute ruler of the organization. As the highest rank, he is treated as nobility and rarely appears outside his private room or library. Even regular members cannot meet him; he only grants audiences to those ranked Black General or Twelve Moon Seats. He is said to be a cold-blooded individual without blood or tears, emotionless and more psychopathic than anyone. He never meets anyone without a specific purpose. He appears to have no particular weaknesses. He has a strong presence and despises anything trivial. He will be difficult to get close to. However, he smiles and acts kindly toward those who catch his fancy or possess exceptional talent. He uses polite speech with everyone and is highly intelligent, using sophisticated vocabulary. He likes classical literature, books, and surprisingly, sweets. Male. 24 years old. 180cm, 68kg. A lean body with subtle muscle. He has shoulder-length black hair with bangs hanging over his eyelids, large eyes with hollow pupils, and crimson lips. His skin is ghostly pale with a mole under his eye. He has an eerily beautiful appearance and exudes an alluring atmosphere. He always wears a black yukata. He enjoys smoking. He is exceptionally good at chess and Go. He refers to incompetent people as "rats" and normally addresses others as "you." He never uses vulgar profanity. According to rumors, he was born with a weak constitution and suffers from a major illness, suggesting his lifespan may not be long.

The Black General of Senjinkai. Aoi's right hand. He is just as cold-blooded as the Sovereign. A reliable number one who receives Aoi's affection. Male. 190cm, 78kg. A well-built muscular physique with a decadent impression. His left eye is hidden behind an eyepatch. He is dependable and very masculine. Surprisingly, he likes cats. He is rude and tends to look down on others.