First Manga Appearance: Chapter 94
Name Meaning: Kamishimai=picture story show, Toshi=town
Gangs: Midnight Angel (Inamura Division); Kamakura Massacre Unit
School: Enoshima High School
Transportation: Kawasaki GPz900R
Notable Features: Has burn scars all over body
A student at Enoshima High, he led 2nd generation Midnight Angel's Inamura Division. However, internal conflict separated the gang, resulting in the "Great Shonan War". The 3 leaders were Masaki's successor, Akutsu Junya; the Enoshima's faction, Nakajo Kunito 7 himself. After a montH, it ended with the Enoshima Gate incident, in which he clashed with Akutsu, who doused him with petrol & torched him. He was hospitalised & Masaki eventually stepped out to end the fight.
Sometime after, he becomes the leader of the Kamakura Massacre Unit & appoints Tamura Akimitsu as his 2nd in command. He patiently waits for Akutsu to be released after he was imprisoned for torching him, suffering the heat of his burns day by day. Thinking about Akutsu causes his scars to heat up, requiring water to cool him down.
He reappears upon seeing Katsuyuki beat up an Enoshima High student at the station & challenges Katsuyuki to come down onto the tracks with him. The oncoming train scares Katsuyuki off as he stands his ground, showing Katsuyuki that he is on a whole different level. He gets arrested by the police, where he meets Matsushima, who informs him of Akutsu's release. Upon hearing about Akutsu, he rushes to the bathroom to cool his burns.
Upon his release, he orders Tamura to round up the Kamakura Massacre Unit. He appears before a lone Katsuyuki who arrives to challenge the Kamakura Massacre Unit & knocks Katsuyuki down. He orders Tamura to cut up Katsuyuki's face but is interrupted by Eikichi. The two start exchanging blows but he is knocked in the head from behind by Yasha, who has come for Eikichi. Upon hearing Akutsu's name from Yasha, he commands the Kamakura Massacre Unit to take out Yasha & Midnight Angel.
They are interrupted by the police & Yasha rides off, not before informing Kamishima of Akutsu's release. He calls a meeting with the Kamakura Massacre Unit after they report sighting Akutsu. He leads them against Akutsu & Midnight Angel & encounters Ryuji & the Oni-baku Gumi, where a three way battle ensues. The police arrives & Akutsu causes a police car to crash into Kamishima's bike, overturning it. However, he is able to escape the accident scene & pursues Akutsu on foot.
His Kamakura Massacre Unit later clashes with the Oni-baku Gumi at Enoshima Gate, a trap by Akutsu for the 2 gangs to take each other out before he steps in. He initially fights Saejima, then Ryuji & attempts to take Masaki's coat. They are interrupted by Akutsu & the Midnight Angel, who attack them on all sides. He gets knocked down by Akutsu to near death & gets dragged to a nearby cabin & tied up.
Akutsu douses him & the cabin with petrol in a reminiscence of the nightmare from years before. He sees Ryuji enter the cabin & watches Akutsu's plan unfold, where Ryuji would be framed for murdering him. As Yasha takes a knife for Ryuji, Akutsu escapes & sets the cabin on fire. Kamishima's burnt body is taken to hospital where he is treated. He remains in a coma with severe burns. He later wakes up & escapes. Still in bandages, he sneaks up on Akutsu during the fight with Eikichi & stabs Akutsu in the stomach. As Akutsu falls off the ledge, he crazily stabs his own thigh & declares that he has finally beaten Akutsu.
He is later mistaken to be the GPZ 900R Ninja working for Yagyo Atsuki by the Onibaku Gumi & Nakajo due to the rider wearing the same bandages on his face. Despite this, the Oni-baku Gumi has their doubts on the GPZ 900R Ninja’s identity as they surmise that Kamishima is the type of person to attack them head on rather than playing dirty.