Kasane Kujiragi

Kujiraki (鯨木) is a character in the Durarara!! light novel and a rogue child of Saika.

She first appears in Volume 10 as Yodogiri Jinnai's secretary, and is described to be a young woman wearing a western suit. She is shown to wear spectacles in illustrations. She is described to be calm and quiet.

(Major Spoilers)

(Based on Chinese translation.)

In Volume 10, Kujiraki shows up first with Yodogiri when dealing with Shijima's family.

She then appears with Yagiri Seitarou to kidnap Yagiri Namie. Kujira incapacitates Yagiri Namie by electricuting her with an electric glove, which Namie remembers Izaya buying before for fun. Namie fights until they tell her they have her brother Seiji, at which point she makes interesting and terrifying threats to be carried out if they touch a hair on his head.

She makes a major appearance in the second half, where Orihara Izaya arranges for Niekawa Haruna's "children" to kill "Yodogiri Jinnai" by driving them over. When the Yodogiri ("Number Eight") beside her is injured, Kujiraki does not respond but proceeds to calmly call another Yodogiri ("Number Five"), with a similar voice, to replace him, only to hear him get knocked down as well over the phone. Izaya calls her, and confronts her as the leader of the organization "Yodogiri Jinnai". At this point, he is being guarded by Slon.

In the conversation, Izaya claims to have had no proof, only guessing based on his own research. On questioning, Kujiraki reveals that although "Kujiraki" is not her real name, the name was given willingly, and the original Kujiraki has likely started a new life in Southeast Asia. The men acting as "Yodogiri Jinnai" are said to have partaken willingly in the prior immoral actions in their own interest. Izaya says that Yodogiri Jinnai has been active since about twenty years ago, and asks about her age despite her young appearances. She claims to have no obligation to answer, evading the question.

Izaya confronts her about spreading rumors in Dollars about Dragon Zombie (/Dead Dragon?), Izaya's gang, having been the culprits behind Kadota's accident. He recognizes her impersonation of Kanra in the online chatroom as a warning, and asks why she added "nya" behind her sentences. Kujiraki says that it's cute. Izaya is incredulous and asks if she wears cat ears and a tail in front of the mirror to pose and say "nya" on her days off. After silence, she says it sound alright and she will try.

Izaya mocks her with the irony that Saika, which she sold to Kishitani Shingen, has become her enemy. (Niekawa Haruna's Saika's children attacked Yodogiri Jinnai.) He skypes to Niekawa Haruna with instructions to have Kujiraki kidnapped.

Kujiraki says that Izaya and Heiwajima Shizuo are obstacles for her motive of "bringing in goods", and reveals that she is aware that Izaya had Shizuo arrested. She proceeds to say that the "children" cannot focus with someone like Shizuo on the streets, although Niekawa Haruna's "children" appear to have given up. She reveals that she was the owner of Saika twenty years ago. Izaya asks if being a previous owner has granted her some privelege, to which she replies that other than cutting, there is another method to increase Saika's children that the current wielders are likely unaware of. She calls this technique branching - to break Saika's original form, and use the shard to smelt another blade.

Izaya turns around, alarmed, only to be grabbed by the throat by Slon and smashed into concrete. Kujiraki asks for Izaya to be taken to an office so she can question him regarding Celty's head.

After this, as she talks to herself, Kujiraki thanks Izaya for dealing with Yodogiri Jinnai and "freeing" her  from her monotonous everyday life. She says Izaya in indeed an obstacle in Ikebukuro, third after the Awakusu organization and Tsukumoya Shinichi.