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SLASH/DOG is a novel written by Ichiei Ishibumi and released on August, 2006. However, due to its lack of popularity, only 1 volume was released. In 2014, Ishibumi reinstated Slash/Dog under the name "Inugami of the Fallen, Slash/Dog (堕天の狗神SLASHDOG, Daten no Inugami SLASHDOG)


Caught with a severe fever, Tobio Ikuse, a second-year high school student, was forced to miss his school trip on a luxury liner with his schoolmates. Four days later, Tobio hears the news about the disappearance of the teachers and second-year students from his school, and it devastates him. A few months after the incident, Tobio, having slowly recovered from the sudden loss of his friends, accidentally encounters one of them again. Chasing after his missing friend Sasaki, Tobio finally manages to catch upto him, but is shocked to see Sasaki alongside a Lizard Monster who attacks him together with the monster. Cornered by the monster, Tobio is rescued by another survivor of the missing luxury liner, Natsume Minagawa, who then hands him an egg before parting ways. Later that night, Tobio finds himself under attack, again, this time by two people with monsters. Amidst all the ensuing chaos, out of Tobio's shadow, came out a Puppy that rescues him. After fending off the two monsters, Natsume once again approaches Tobio before finally deciding to take him to their hideout.


Tobio Ikuse
The main character of Slash/Dog. He is the possessor of the Longinus, Canis Lykaon.
Sae Toujou
Tobio's childhood friend who went missing after sea accident on their school trip inside a luxury liner.
Natsume Minagawa
Another survivor of the missing luxury liner like Tobio. She is the first person to teach Tobio about the Sacred Gear.
Kouki Samejima
A well-known school delinquent, like Tobio and Natsume, Samejima is a survivor of the missing luxury liner incident.
Lavinia Reni
A magician from the organization, Grauzauberer, sent to assist Tobio. She is the possessor of the Longinus, Absolute Demise.
The Governor General of the Fallen Angel organization, Grigori. He was the one who gave Natsume and Samejima the eggs which allowed them to hatch their Sacred Gears.
Vali Lucifer
The descendant of the Satan Lucifer and possessor of the Longinus, Divine Dividing.
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