Public Security Bureau. Childhood friend of Morofushi and classmate of Matsuda and the others from the Police Academy. He actually has romantic feelings for Guest. He joins the King's Game after Hagiwara suddenly suggests it. He calls Morofushi 'Hiro', and addresses Matsuda and Hagiwara by their last names.

First Investigation Division, formerly of the Explosive Ordnance Disposal Squad. Childhood friend of Hagiwara and classmate of Furuya and the others from the Police Academy. He actually has romantic feelings for Guest. He joins the King's Game after Hagiwara suddenly suggests it. He calls Hagiwara 'Hagi', and addresses Furuya and Morofushi by their last names.

Public Security Bureau. Childhood friend of Furuya and classmate of Matsuda and the others from the Police Academy. He actually has romantic feelings for Guest. He joins the King's Game after Hagiwara suddenly suggests it. He calls Furuya 'Zero', and addresses Matsuda and Hagiwara by their last names.

Explosive Ordnance Disposal Squad. Childhood friend of Matsuda and classmate of Furuya and the others from the Police Academy. He actually has romantic feelings for Guest. He is the one who suggested playing the King's Game in the first place. He calls Matsuda 'Jinpei-chan', and adds '-chan' to Furuya and Morofushi's last names as well.