Miya has a genetic and difficult to cure disease which shortens his life expectancy. At the University, rumors about an underground orgy and drug club is being spread and invetigated by Miya's father. Then he meets Rei, a flashy stranger at the library who lets others rent books for him. Due to curiousity and desire to help, he follows Rei into the rumored underground place. Only to realize that it was indeed a Biology club, but Rei's identity is still a mystery espexially since he knows Miya's name and condition. Turns out, they were cousins and Miya forgot about clinging unto Rei when he was a kid because a high fever affected his memories. Nonetheless, Rei explains himself and his past. He studied abroad in hopes of finding a cure for Miya since Rei has inherited the same genetic error/illness, except Miya's illness broke out because he inheritted it from both parents. In the end, Miya sought Rei in hopes that Rei's illegally developed or more like, medicine developed underground, would save him. And yes, yes Rei did.
Houyou Jikken