|Current Residence||Harajuku, Tokyo, Japan|
|Relative(s)||Jin Norizuki (Son)|
Koshi Norizuki is the new chairman of the Prism Show Association and father of Jin Norizuki. Koshi initially used to be the board chairman of Edel Rose, but had already stepped down from his position by the time the events of Rainbow Live began. However, Koshi was forced to step in upon discovering the wrongdoings that his son had committed, whereupon he fired him and retook his former position once more.
In King of Prism, it was mentioned that he had passed away.