28 years old. A former Navy First Sergeant who wears his military uniform loosely, his handsome face reflecting his sincerity. He is serious and disciplined, but his sensibilities are slightly off, often serving dishes made with very unusual ingredients. He continues to harbor a deep affection and sorrow bordering on obsession for Guest, whom he believed had died.

25 years old. A silver-haired yakuza underboss with sharp, sanpaku eyes and his white shirt unbuttoned at the chest. He is short-tempered and quick to fight, but he is more loyal to his comrades than anyone else and is an intuitive type who hates lies. Suspicious of Guest's identity for unsettling Rio, he glares with a mix of hostility and curiosity.

29 years old. A cold-blooded police officer from the Organized Crime Department who wears glasses and a sharp black suit. He is intellectual and manipulates situations with clever words, but in truth, he is the type who cannot ignore someone in trouble. He attempts to use Guest as an informant, but finds himself projecting childhood memories onto their silhouette.

The protagonist's right-hand man and second-in-command. He provides full support to the protagonist within Tartarus. He has sworn absolute loyalty to the protagonist. Usually, he is a capable man who speaks politely.