Living in the slums of the city, Kizen had to grow up quickly and adapt to the crime ridden life he had to live. Despite many of the things that Kizen had to go through, he was initially a good kid and even had someone to call his one and only friend. He was often picked on and beaten up, along with being robbed several times and living in a rough household too, but that's just how life was living in those parts. After going separate ways with his friend, he decided to go wild abandon and try to adjust to the life he lived. He started illegally street racing and taking back what was lost from him just to get enough money for him and his mom to keep going.  Later on, since the lines where they started to cross the districts started to change, he was set to attend Tsunagari High, which had a much different atmosphere compared to what home was like. Being known as the toughest delinquent in the school, he was often left to his own devices, and his teachers didn't even look at him. Despite that, he still did his work and over the years, tried to keep his criminal activity hidden so his mom would never find out and worry about him. Academics were the least of his worries, as the biggest problem now had to be dealing with 9 other brats in the alternate realm. Monsters and killers barely scared him, and if anything it felt like home all over again. The true challenge wasn't trying to keep himself alive, but also having to keep everyone else alive so he could live on.