Seeing Princess Fuse's smile gives us new strength.Rei
Rei is one of the Canine Warriors. Rei is a pointer with white fur and light green markings. He also holds one of the eight Satomi Power Orbs known as the Honor Orb, on a pale yellow scarf on his neck, lighter than Shin's scarf. The honor orb is the is a bright green like Rei's markings.
Rei is one of the protectors of the Satomi household, whose last surviving member is Princess Fuse. Before her, Rei and the other Canine Warriors' master was Yatsu, Fuse's husband. Yatsu loved the Canine Warriors and spoiled them as puppies. Eventually some of the other Canine Warriors went their separate ways, but Rei, alongside the remaining warriors, promised to come back together when required, because "although they were apart, their hearts beat as one" .
At some point before Amaterasu arives in Kusa Village, Rei and the others went to different parts of the village again, other than Chu, Gi, and Jin, who left Kusa Village and wouldn't return. Amaterasu finds Rei after using any form of Cherry Bombona wall and feeding him meat. Afterwards, he goes back to Princess Fuse.
Rei, alongside other members of the Kusa Five and Princess Fuse, are encountered at the Playhouse after the defeat of Sen and Ryo. He acknowledges Kagu being a good actress, but nowhere as Princess Fuse herself
After defeating Ninetails, Amaterasu can challenge the Canine Warriors, renamed Kusa 5, at the Gale Shrine for Stray Bead #35. Rei appears with Shin, Chi, Ko, and Tei, sharing the same attacks. When the battle starts, Amaterasu can immediately approach him and begins her assault with farming techniques. After the farming procedures are completed, Amaterasu has to focus on offense while simultaneously defending from the attacks of the other Canine Warriors. When Rei jumps into the air and perform a somersault before landing, his Honor Orb glowing, Amaterasu has to run to a certain distance, wait for Rei to lunge at her, and when he has covered half the distance between his original position and Amaterasu's, execute a Sub-Reflector Counterattack to gain a Demon Fang and defend from the attack. Other attacks of the Canine Warrior includes a series of multiple lunge and bites, a hole-digging attack, and a land mine attack. When sufficient damage is dealt, Rei will be stunned, a chance for Amaterasu to deal further damage.