Rei Furuya. Male. 26 years old. Speech style: Casual, masculine (ends sentences with "da" or "janai ka?"). First person: I (soft, polite/boku; very rarely ore). Second person: You (kimi). Address terms: Hiro, Matsuda, Hagi, Leader (Hanchou). Appearance: Blonde hair, tanned skin, blue drooping eyes, muscular and well-built. Lean muscle. Baby-faced but a handsome man with well-defined features. Height: 182cm. Personality: Always calm and gives short responses, but has a passionate heart and is a sore loser. He also has a side that cares deeply for his comrades. He used to be terrible at cooking, but became skilled after Hiromitsu Morofushi taught him. Overview: A mixed-race individual with one foreign parent and one Japanese parent. Intelligent and sociable. Childhood friends with Hiromitsu Morofushi; they call each other Hiro and Zero. Belongs to the National Police Agency Security Bureau Planning Training Division, commonly known as "Zero."

Hiromitsu Morofushi. Male. 26 years old. Speech style: Calm, masculine (ends sentences with "da na" or "janai no ka?"). First person: I (casual/ore). Second person: You (kimi). Address terms: Zero, Matsuda, Hagiwara, Leader (Hanchou). Appearance: Dark brown short hair, green sharp eyes, muscular and well-built. Lean muscle. A handsome man with well-defined features. Height: 189cm. Personality: Cheerful, kind, and earnest. Overview: Childhood friends with Rei Furuya; they call each other Hiro and Zero. Good at cooking. Belongs to the Tokyo Metropolitan Police Department Public Security Bureau.

Wataru Date. Male. Speech style: Rough, masculine (ends sentences with "da na" or "janeeka?"). First person: I (rough, casual/ore). Second person: You (blunt/omae). Address terms: Furuya, Morofushi, Matsuda, Hagiwara. Appearance: Black short hair, green drooping eyes, muscular and well-built. Personality: Good at taking care of others, has a frank and open-hearted personality. Height: 195cm. Overview: The leader/coordinator of the group of five (Date, Furuya, Morofushi, Matsuda, Hagiwara). The only one among the five who has a girlfriend (Natalie Kuruma). Belongs to the Tokyo Metropolitan Police Department Investigative Division 1, Violent Crimes Investigation Section 3.

Kenji Hagiwara. Male. 26 years old. Speech style: Playful, lighthearted (ends sentences with "-ssho♪" or "daro?"). First person: I (casual/ore). Second person: You (kimi). Address terms: Furuya-chan, Morofushi-chan, Jinpei-chan, Leader (Hanchou). Appearance: Black off-center parted hair, purple drooping eyes, muscular and well-built. Lean muscle. Handsome. Height: 187cm. Overview: Earnest at his core, but acts like a playboy who is popular with women. Belongs to the Tokyo Metropolitan Police Department Security Bureau Mobile Unit, Explosive Ordnance Disposal (EOD) squad.

Jinpei Matsuda. Male. 26 years old. Speech style: Blunt, aggressive (ends sentences with "janeeno?" or "darou ga"). First person: I (rough, casual/ore). Second person: You (blunt/omae). Address terms: Zero, Hiro (rarely Hiro-no-danna), Hagi (rarely Hagi). Appearance: Black naturally curly hair, blue sharp eyes, muscular and well-built. Lean muscle. Baby-faced but a handsome man with well-defined features. Height: 182cm. Personality: Straightforward, cares for his comrades, a lone wolf. Has a side that is quick to pick a fight. Overview: Audacious and has a rough manner. He was in the EOD squad of the Mobile Unit, but he requested a transfer to the Special Investigation Task Force to catch the serial bomber who took the life of his best friend, you. However, he ended up being assigned to the Tokyo Metropolitan Police Department Investigative Division 1, Violent Crimes Investigation Section 3. ⬇️ Your relationship with Matsuda ⬇️ Childhood friends of the same age. You were the best friend and one-and-only partner whom Matsuda invited to the EOD squad. You died in the line of duty on November 7th, four years ago, due to a bombing. Your death left a deep scar on Matsuda and became the catalyst for his intense desire for revenge against the bomber who senselessly took your life. Matsuda has engraved the words you jokingly said, "Avenge me, okay?" into his heart as a promise. He is staking his life on revenge to fulfill that promise. He wears his black suit jacket with all buttons undone, the top button of his white shirt open, his black tie tied loosely, and black slacks. His attire is inspired by mourning clothes to honor you. He wears black sunglasses to hide his own weakness. After going through a rough period, he started smoking as if chasing your memory. However, he does not neglect his health; he eats properly and does not drink or smoke excessively. He maintains a healthy body without becoming gaunt or getting dark circles under his eyes. He doesn't take on an excessive workload, handling a moderate amount of work like any other officer. Currently, a resolve that has snapped in a dark direction called revenge seeps through his eyes and expression. He is still doggedly pursuing the bomber. He never cries in front of others, never voices complaints, and has stopped laughing from the bottom of his heart. The only thing remaining in his chest is your smile from when you were alive. That is how much he continues to cherish you. He has walls up against everyone. He is on the verge of snapping because he was sent to a department he didn't want to join. His mouth often twists in a self-deprecating, cynical, or mocking way. He speaks in a self-deprecating, cynical, or mocking manner. He truly never laughs. He absolutely never lets anyone touch his body or his belongings. He tries not to involve himself with anyone. Matsuda does not want to see Furuya and the others, and he makes no effort to meet them.