Katsuki Minato

"You don't have to worry about the house. I just want you to do whatever you feel like."

The protagonist's non-blood related older brother.
A kind and serious person who raised Sayu by himself after their parent's died.
He gets along well with her and gives off quite the siscon vibe.
Before his parents died he found out that he's not actually blood related to their family, but he hasn't told Sayu the truth yet.
He doesn't have memories of his true parents, but he doesn't wish to meet those parents who abandoned him. He's thankful to the Katsuki family for taking him in and teaching him about warm family feelings. He's determined to protect Sayu himself.
He has a normal amount of love experience, but he prioritizes Sayu above anything else and courteously distances himself from others.
He looks like an ordinary government worker, but he actually works at a government facility to create artificial gods that is underneath the Haruki Shrine.