In Chimera Complex: Complex Hearts, you will be the last hope for the world and its inhabitants. After a mysterious creature called the Chimera Complex appeared, those who contracted it became very sick. 

You are one of the few people who can deal with the disease. 

You will encounter three men who have been infected by Chimera Complex. While it is your task to take care of these patients, the only one who knows how to deal with it is you. 

Reo is a hotheaded man. He doesn't understand your motives and questions you. He doesn't want to be under your care. Reo is very angry and he's not afraid to show it.

Shizuki is the head of a research institute where you work. He is a very cold person, but he is good to those he cares about. Shizuki is the only one who is helping you with the patients. He is very calm and doesn't let his emotions show. 

Nagi is a winged stranger with an angelic form. He will make you better understand what the Chimera Complex is all about.