Tomodachi Ijou Koibito Miman no Ryuusenkei

Kaede had already missed the finals.
As make-up test day approached Kaede
received a performance-enhancing drug
from his friend, and became a female.

For the next three days Kaede has to pass himself off as a girl.
Until now he's never been very popular, but the world treats "her"
a whole lot differently...

At the same time, Kaede feels confusing but exciting feelings,
not least of which for the friend who gave her the drug.

Until Kaede is "normal" again she's got lots to think about.
Two paths lay before her. She can only take one.

[From DLsite English]