Sōji fled to the Artificial Island after a shootout went wrong back on the mainland -- as a young, idealistic cop he'd managed to wound Ginga Kanashima during a gunfight, but in the process he accidentally killed a innocent girl with a stray bullet. As a result of the incident, Sōji is plagued with nightmares, and abhorres guns more than anything.
In 2019, Sōji was personally responsible for stopping a vicious gunfight between Seiichi Kugi and Hayato Inui, suffering severe injuries in the process. In the aftermath he gives Kelly Yatsufusa his phone number, and eventually the two become lovers.
He spends the next several months visiting the graves of his superior and the girl he'd killed back on the mainland, and upon his return to the island he is shocked to learn that the island has been victim to several explosions and murders, all of which are thanks to a vengeful Ginga. Sōji is stricken with guilt at the realization that everything his fault, and does not fight back when Lihuang Ei and his men assault him.
Kelly drives an injured Sōji to the heart of the island (a massive engine), where the Guard Team and the Chinese Mafia are facing off (with others on the scene) and leaps downward to interfere in the confrontation between Lihuang and Jun Sahara. Pandemonium ensues when Ginga is revealed as present in the crowd (masquerading as Sherlock Liverpool).
Through the ensuing smokescreen, Sōji protects Gitarin from the Chinese Mafia executives, taking down various foes with the aid of his bulletproof clothing (which - while they stop the bullets, cannot protect him from damage to his ribs and organs).
In the aftermath of the battle, Sōji watches a video addressed to him from Ginga inside Kelly's van. In the video, Ginga tells Sōji that he believes that Sōji is bound for heaven. He wants Sōji to suffer, and tells him that as long that he loves Kelly he will never be able to commit suicide or escape the island -- and so, he'll have to live on with the dead girl's eyes burned into his memories. As he talks with Kelly, he thinks to himself that Ginga was wrong - he is bound for hell, not heaven, and when he arrives there he'll find Ginga in hell and tell him serves you right. Sōji vows that he will always remain true to himself.
(Sections: Appearance | Personality | Chronology etc. forthcoming)
- Sōji is the son of Kinnosuke Kuzuhara, a motorcycle cop who features in Durarara!!, one of Ryohgo Narita's other light novel series.
- He has a relative (possibly a brother) who is a classmate of Mikado Ryuugamine from Durarara!!, and a cousin called Shinju (who also appears in Durarara!!).
- He always orders the omelet-soba combo at Mrs. Iizuka's restaurant.