Ayano Tateyama. The girl who had an unknown disease that have no cure. It had been confirmed that it may lead to death. Doctors from different countries had admitted that the disease was nothing they know. But only Kisaragi Shintaro, a doctor who had seemed to taken an interest on the case, promised to find a cure. After all, there was nothing interests him more than this. The two needed each other, to be able to fulfill their needs. But what if their status — friend with benefits — had took a step to a higher level?