Sera Himeura

Sera Himeura is the first ib that the main character Kuro Fukase meets. When she reaches out her hand to him, Kuro decides to go with her and enter the world of instant bullet. Though their paths are linked by that fateful meeting, it seems that they will face each other one day as enemies, a hero against a villain. She is also part of the organization Colorful. She regards Iroha as her senpai. She tried to destroy the world in the final chapter, but she was stopped by Yume, who was traveling in time.