Sukisho!! is actually a series of videogames based on a series of novels by Tsutae Yuzu (also does art for games). it's is a boys love, aka Yaoi.
PLOT BASED FROM FIRST GAME! Hashiba Sora falls out of a three-story building and when he returns to school from the hospital, he gets a new roommate-Fujimori Sunao. Sora's best friend, Honjou Matsuri, tells Sora that Sunao was Sora's childhood friend. Sora and Sunao were lab experiments together. Because of the fall, Sora can't remember anything about Sunao or his childhood. This obviously gets Sunao very upset. Everytime Sora tries to remember, strange things happen. Sora's main goal is to find out why he fell from building. During the game, there are many possible events taht can take place and lots of other characters as well. Because of the lab experimentation, both Sora and Sunao have an alter personality; Sora's is Yoru and Sunao's is Ran. Ran only comes out if Yoru is out.
There are at least four PC games total and at least four novels as well. There are also at least four drama cds, and there is one manga. And there is one PS2 game somewhere. Unfortunately, I only own the fourth PC game and the manga ^^;.