Official English Translation on Renta

Based on a promise with his best friend and pro soccer player, Yukihiko, Tetsu becomes an orthopedic surgeon. But, when Tetsu sees Yukihiko for the first time in a while, Yukihiko has had a career-ending injury and is now deep in sorrow and self-pity. After getting drunk, on his way home Yukihiko falls down some stairs and loses his memory of everything after high school. Tetsu's always been in love with Yukihiko, so he uses his current condition to lie to him that they're dating!

This is a love story that starts from a lie between a clumsy doctor who's had a crush his whole life, and a soccer player at the end of his career.

"If you're going to study Medicine, then become a doctor who can look after me when I'm injured!"

This is the promise that was made between Amamiya and his best friend Kaji soon before graduation. Flash forward a decade and Amamiya has become a skilled orthopaedist, while Kaji finds himself dealing with an injury that has brought his thriving football career to a premature end.

Hoping to cheer up his unemployed, recently-divorced friend, Amamiya takes him out for dinner. Afterwards, a heavily-drunk Kaji gets into an accident that leaves him with no memory of events after his high school years. In the heat of the moment Amamiya, who has long harboured unrequited feelings for Kaji, blurts out, "I'm your lover. Please come home with me"...!?

(Modified from the description by Fujoshi Bitches)