The remastered release will feature updated image sizes and some revised portraits and CG images. Kogado Studio clarified that this is not a remake—do not expect anything like additional story routes.
Hakuisei Renai Shoukougun was originally released for PSP in September 2011 in Japan. An enhanced version, Hakuisei Renai Soukougun RE: Therapy, was released for PSP and PC in June 2012.
Here is an overview of the game, via VNDB:
The story follows Sawai Kaori who almost died in a traffic accident at the age of 10 but was revived by hospital staff. Ever since then, Kaori became determined to take up ‘nursing’ as her means of saying thanks to the doctors who rescued her. And so at the age of 21, she begins her journey as a nurse…