Kento Amagase is an employee of the ReLIFE Research & Development Division, where he is part of the science team behind the pills used on the ReLIFE experiment.
He is a brown-haired man that wears glasses and dressed in a white coat, like any typical scientist.
He is very playful as he is seen messing around with Yoake and Onoya in several occasions. But he also has a serious side. He gives advice and helps his colleagues of the Support Division when they have problems with the experiment.
When Kaizaki and Hishiro start working in ReLIFE he also teases them about their relationship by caling Kaizaki (Hishiro's) "Husband".