Bayron City - a Mega-Float type city in the Pacific Ocean, which doesn't belong to any particular nation, is well known for Orgonium, a new energy resource. The city is growing in popularity and suddenly incidents caused by demons called D Hazards start occurring frequently. Only a handful of people know about their existence. Shu is a young manga who lives in a city and runs a tiny company. His private and work life are being supported by Kisara, a high schooler who helps him out. One more person keeps him in her mind: Ayano - an employee of a company that Shu used to work for and his ex-girlfriend. At the root of Kisara's strong attachment to Shu is a contract signed between them. Their uncertain bond teeters between love and contract. Where is their destiny headed..?