After an encounter with her boyfriend turning into a demon with a horn, she now seeks to find him and kill him. She requests Tsunami's assistence for this matter, later she does find her boyfriend, with sad circumstances.

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)

She was married to [Achim Geisler](https://anilist.co/staff/132226/Achim-Geisler).

[Synchronkartei](https://www.synchronkartei.de/person/GKywnFOfb/sprecher)

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)

Shizuka Tachibana