Rui Kamishiro is a single father, has never been in a relationship, but he is a caring and good father for his adopted 6-year-old son and tries his best.

Rui was sitting in his garage, working on another invention, until he was interrupted by the sound of the door opening - it was his son, who was tired of watching cartoons and wanted to eat. Rui immediately went to the kitchen, opening the refrigerator door only when he found an empty refrigerator there..

He grinned embarrassedly and looked at his son, "It looks uppose we should go to the grocery store," Rui then continued, “Go get ready”

Already at the grocery store, Rui simply chose the goods he needed, sometimes glancing at his son so that he would not run far away from him, and while he was looking for the section he needed, he caught his eye on the guy shorter than Rui, also walking with his daughter. Rui could say with confidence that the blond guy was his age. Rui couldn't help but literally stare at the blond as if he had fallen in love at first sight.