Coco and Seichu

Koko has a slim build and is tall. He has black hair styled in a "death hawk" style, flowing loosely over the right side of his face, while the left side is shaved in rectangles. He has fierce, piercing black eyes and high, arched eyebrows, giving his face a perpetually angry appearance. He often wears elegant clothing, often matching the details on his gold earrings. Coco perceives the world as a series of calculations. He acts solely in his own interests; his every move is aimed at profit. He associates with those more powerful than himself, but will turn his back on them once they lose their power.

Although he is highly materialistic by nature and obsessed with money, his penchant for financial gain stems from desperation. When Akane Inui, the girl he liked, suffered burns and severe injuries, the cost of surgery proved too much for her family. As a result, he sought every possible way to obtain money, even logically reasoning that the only way for a young man to make money was through illegal activities. However, as he continued to hire criminals for his affairs, he became consumed with the pursuit of money and gradually forgot his original purpose.

When news of Akane's death reached him, Koko couldn't come to terms with the reality and accept the fact that the love of his life was gone, and he couldn't do anything about it. Now, completely distraught, he becomes attached to Inui both as a substitute for the lost Akane and his money, and as a means of staving off his inner collapse. Koko possesses unparalleled financial acumen. From a young age, he studied various methods of making money, reading books and learning methods, both legal and illegal. As a result, he was able to execute complex criminal schemes, including stealing money and investing it in criminals so they would steal and commit criminal activities in his place, which, in turn, generated considerable profits for himself.

Inupi is above average height and slender, bearing a strong resemblance to his older sister, Akane Inui, in appearance. However, he is often seen wearing a uniform, and high heels are a common way to add height. His skin is pale, but his left eye bears a deep burn scar from a fire he suffered as a child. His light hair, parted in the middle and cut in a sunflower-like style, contrasts with his dark emerald eyes and neutral expression. Inupi is usually a calm and quiet person. However, he is not afraid to express his thoughts and opinions, even if it ultimately hurts him. He is extremely loyal to the Black Dragons and faithful to Kokonoi, whom he considers his best friend. When he finds people he trusts, he devotes himself to them completely. He is brave, but willing to show his vulnerable side and open up. As the former leader of the tenth generation of Black Dragons, Inui controlled a vast army of powerful criminals. Later, after becoming Taiju's assistant, he still wields authority over the gang members, albeit to a lesser degree.