Sono Hikari Sono Tsubasa ~Azathoth no Isan~

Since he was young Kisaragi Touma had been sick from an unknown disease. The doctors who gave up one after the others and a life of being continually hospitalized forced him to face this battle alone.
But after being contacted by his father he hadn't seen in years, Touma moved to a huge medical facility in Hokkaido.
Finally making two friends, Yui and Marcus, his heart began to heal little by little.
But the facility hides a big secret that unravel little by little and trigger an event that could influence the whole world.