Rokurouta Sakuragi

Rokurouta Sakuragi (桜木 六郎太 Sakuragi Rokurouta) (voiced by: Rikiya Koyama), aged eighteen, and referred as 'An-chan' (bro) by his cell-mates, is the oldest of the seven protagonists in Rainbow. He is a strong and benevolent young man who is treasured by his friends and is considered to be a role model to them. He also has great boxing technique, which he demonstrated by knocking out all six newcomers when Mario Minakami started a fight. He constantly looks out for the well-being of his cell-mates. This often means sacrificing himself for them, making him the routine victim of Ishihara's schemes. He is the only boy at the prison who does not fear Ishihara.

Appearance
Sakuragi is a tall, handsome and muscular young man with dark brown hair and light brown pointed eyes.

History
When he was younger, his father and five brothers went off to war. Only his father survived, returning home a broken and drunk man. Sakuragi's father later committed suicide after arguing with Sakuragi one night, leaving Sakuragi racked with guilt. As a result of this, Sakuragi resolves to never lose anyone else important to him. His friend and former cell mate, Hagino, was violated by Dr. Sasaki. Before committing suicide because of the rape, Hagino wrote a suicidal note which blames the two of them, giving Sakuragi evidence of Ishihara's and Dr. Sasaki's crimes. Due to this, Ishihara and Dr. Sasaki both want him dead. After being stabbed by Ishihara, he goes to see Mario Minakami's boxing match, but is shot down by American soldiers on his way there.

At the end of the series, while Mario sits under the tree of promises, a very short rain begins, a rainbow appears and Rokourota also appears and asks Mario what his dream is, Mario obviously replies that he already knows, and that  since he is dead he will make his boxer dream come true (I will be happy if all your dreams come true). Immediately afterwards Mario warns himself and so does Rokourota. They eventually start boxing training just like they did at the beginning of the series

Relationships
Sakuragi was in love with a nurse named Setsuko Koike that he wanted eventually to marry her. They fell in love when Sakuragi was treated at the Hospital for the first time due to deadly damage to his body.