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Rokurouta Sakuragi (桜木 六郎太)Sakuragi Rokurouta, aged eighteen, and referred as 'An-chan' by his cell mates. He is the oldest of the seven main characters. He is strong and has great boxing technique which he used to take on all the six newcomers when Mario instigated a fight at their first encounter.
After defeating the six, Sakuragi is punished by the guard, and even while beaten brutally, he protected the six by taking all the blame. They learned the harsh reality of the world they were now in, and the six new cell mates realized that Sakuragi is in fact a kind person that is worthy to look upon and soon start to refer him as An-chan (can be translated as an 'intimate bro'). Sakuragi is the pillar and key figure through his words and actions for the rest throughout the series, especially Mario.
The reason why Sakuragi has been detained is unknown at first. Rumors are he killed his own parents.