甘粕 正彦

He is the first and strongest Rosei. He was the first Rosei to conquer the dream world in one cycle by himself.

Masahiko is one who loves people from all his heart, to the extent of madness. Yet he deems people bad at nature and does not unconditionally believe them, like Yoshiya. He intended to make great sacrifices, cause great calamity, and pose as Demon King to inspire their courage and radiance. His ideal world is one of fighting warlords.

Truth be told, he is like a kid who reads books, watches films, and wants to see more and more. At the very end, he was so carried away that he threw away even his goal and was taught back by Hiiragi Yoshiya.