Main character of the anime and manga, he's a flame manipulator, working as a detective he helps Shizuka find the Oni with a horn, who was her lover before he was turned into the Oni. He is a mysterious character when it comes to his background. He's lived for a long time in various places as well.

From the beginning of time, Earth has been enslaved by the powerful and grotesque Ogres. The dominance these arrogant immortals hold over the helpless victims is challenged only by the noble Guardians. 
 
Eons later, in the year 2089, few Ogres of Guardians remain in Neo-Shinjuku. Humans rule the Earth; yet, deep within the dark underworld of the city, the supreme Ogre is still alive and is preparing, once again, to enslave the Human race. 
 
(Source: Urban Vision)

Holds a 2nd Dan rank in Kendo. A veteran Japanese voice actor who has played characters in anime, drama CDs and video games. Apart from voice work, Toshihiko Seki sometimes does live-action drama stage work and is a member of 81 Produce.

__Non-anime roles:__
• Dottore (Genshin Impact)
• Chongyue (Arknights)

Andrew Philpot,  commonly credited as Andy Philpot, is an American actor and voice actor. He is known for several animations and video game voice roles, he is best known for his role as "D" in Vampire Hunter D Bloodlust and many in titles directed by Jack Fletcher. He is currently a Resident Artist at the Pacific Conservatory of the Performing Arts in Santa Maria, California.

Non-anime roles:  Baron Lived/Devil in "Timm Thaler" (TV series, 2002) (German)  

The year is 2019, and Shinjuku's drug trade just got a whole lot bloodier. A new narcotic endows users with demon-like horns, fangs and a raging appetite for human flesh. When a man named Eiji Kuraza transforms into a murderous demon and then goes missing, his girlfriend Shizuka will stop at nothing to find him.
 
Following a trail of violence, narcotics and prostitution to the yakuza, Shizuka hires supernatural P.I. Tsunami for his expert legwork while Shizuka joins the red light district to conduct her own investigation on her back. If Shizuka's recklessness pays off, Eiji may force her to satisfy an appetite unfamiliar to call-girls... 
(Source: DMP)

Tsunami Shijo