Jakurai is 35 and a doctor who works at Shinjuku General Hospital. Though he has a dark past, he has dedicated his life serving those in need. He is very good at staying mature and composed even in dire situations, which causes people to dote on him and look up to him, especially his teammates, Hifumi and Doppo. He was former teammates with Ramuda Amemura, who he now shares a mutual disdain for, though they try to maintain a reasonable demeanor in the presence of others.