Cant Love (Aoi x Uruha)

Uruha was born with an abnormal disease. This disease had been nearly unheard of until Uruha was born, being 1 of 4 people in Japan to have it. Doctors had no clue what to call this disease.
All Uruha's life he had continuously pushed people away in fear of his life being cut short without an explanation to give. Uruha was a good student, always doing his homework and making good grades then staying home to help his mother around the house as his father had abandoned them when he was just a baby.
Aoi, one of Uruha's classmates, has fallen inlove with Uruha even though he knows so little about this quiet boy. Aoi tries his best to befriend Uruha in hopes of someday becoming more than friends. Uruha is a bit reluctant to let Aoi into his life but accepts the raven-haired boy.
Aoi eventually does get close to Uruha and even learns of his disease but continued to stay by his side even though there are many difficulties.
On the side of Aoi and Uruha's relationship there is trouble happening with Ruki and Reita. Ruki was frightened of love and sex and refused to give himself to anyone. Ruki spent lots of time with his older brother, Masato until Reita came into the picture. After loosing Masato, is Ruki actually happy with his choice of choosing Reita?
Will this story end filled with love or heartbreak and tragedy?