First Manga Appearance: Chapter 40
Name Meaning: Shindoji=depth, Fumi=letter; writings
School: Kyokuto High School
Transportation: Yamaha V-Max
Notable Features: Wears dark sunglasses; has long hair; eyes described as terrifying
Lost his parents at a young age & was very close to his older brother. He started riding bikes to be like his brother. He first meets Ayumi through his brother & loved herlike an older sister. When his brother died in a motorbike accident on Xmas Eve, he tells a mourning Ayumi that she has to love his brother forever & that he will kill her if she ever betrays his brother. He inherits his brother's Yamaha V-Max & still believes that his brother is alive through his bike.
He transfers to Kyokuto High in his 1st year of high school soon after the Oni-baku's departure & immediately starts attacking the 2nd years for still honoring the Oni-baku. He brutally beats 10 of them down, all of which require hospitalisation. Sawamura, Ishiyama & Kato, all previous associates of the Oni-baku, fell victim to his rampage.
Sometime after transferring to Kyokuto, he finds out Ayumi's relationship with Ryuji & sets out to take down the Oni-baku, aiming to abolish the Oni-baku legend at Kyokuto. He follows Ayumi & Ryuji, attacking them on their date & declares to Ayumi that he will send her straight to hell for betraying his brother. He orders the Kyokuto 1st years to attack any Tsujido students on sight.
He attacks Saejima at the station & kidnaps Ayumi. After throwing Ayumi off his bike, he reveals to a surprised Ryuji of Ayumi's plan to marry & drives off. He later stabs Kamata in the back after he attempts to help a Tsujido student from some Kyokuto students. He quickly beats down Eikichi after Eikichi goes after Fumiya alone & ends up facing a gang of Kyokuto High students. He kidnaps Ayumi once again when she arrives to aid Eikichi.
He calls Ryuji to come alone to Enoshima Station & the two ride off, with Ryuji close behind. He attempts to sabotage Ryuji's bike, causing Ryuji to fall off the edge of the road. A determined Ryuji climbs back up & the two fight. An oncoming truck crashes into his bike & he falls off the edge. As the V-Max explodes to pieces, he realises his brother's answers to his actions. Ryuji saves him from falling & he finally lets go of his deceased brother.
Before being taken away by the police, he visits Ayumi & Ryuji in the hospital & apologises for his actions. He tells Ayumi to take care of Ayumi for him, as it would've been what his brother wanted. He later appears as an ally of the Oni-baku.