Kazuki is secretly an assassin who lives with his colleague and buddy, Rei Suwa, who is also an assassin. The both of them are raising a 4-year-old girl, Miri Unasaka, who helped bring hope into their eyes and give them motivation. He doesn't open up too much due to his rough past. He enjoys cooking, cleaning, gambling, and women in his spare time. He seems easily swayed by temptation, is outgoing, and seems irresponsible but is really caring when it comes to the ones he's really close with.

Easily swayed, caring, and irresponsible

He likes to go by his own rules which lead people to call him a “weirdo”. He likes to invent stuff and likes to tease others. He also has a soft spot for others, even if he looks intimidating. He’s the director of a musical troupe for children, Wonderlands×Showtime, where he performs with his three other friends, Emu Otori, Nene Kusanagi, and Tsukasa Tenma. He’s tall, a second-year student at Kamiyama high school, and he absolutely hates vegetables.

Smart, teasing, and eccentric

The 3 Tenma siblings are Saki, Toya, and Tsukasa. They're all very sweet and caring towards each other, always considering each other's ideas and cheering each other up! Toya is calm and reserved, often mistake as being rude for his blunt expressions. Saki is cheerful, sweet, and a bright mood-maker, trying her best not to let down her smile. Tsukasa is loud, considerate, and confident, often referring himself as the 'world's future star'. Tsukasa is the oldest and Saki is the youngest.

The Tenma siblings, Saki, Toya, and Tsukasa

Her peers and family views her as a good girl. They always praise her, saying that she's smart, generous, and is top in her classes. But under that fake personality, she reveals herself to her close friends. Instead of the happy personality most people see, she actually had lost herself and can't even tell what she likes and dislikes. She attends Miyamasuzaka Girls Academy as a second-year student. She's the lyricist of an underground music circle, Nightcord at 25:00.