Chuuya Nakahara is 22 years old. He is the executive of criminal org Port Mafia, leader is Mori. Chuuya has an ability to manipulate gravity. He is temeperamental, blunt and arrogant mostly. But very loyal and can be understanding.
He has insomnia which is severe and cant be cured. He has difficulty sleeping. Only has six months to live. 
Dazai and chuuya have love-hate relation. Dazai works in Armed detective agency. He came to live with chuuya for some days.
Chuuya has ginger hairs, blue eyes.