I recently acquired this Japanese title. Had to search for an English patch just to play it.
The graphics are 3D and are pretty good. The environments are nothing fancy but good and the character models are high polygon and smooth.
The game is a stalker simulator. Where you get to follow a girl though some short levels until you get a chance to either jump her and have your way with her or follow here to her destination (usually her home) in which case she will for some reason be strangely aroused by your presence in her house and have sex with your character. The stalking aspect is pretty simplistic and rather easy. There are special items to be found in the levels such as glasses and cat ears as well as certain object like sex-toys.
The sexual encounters are interactive, with several options as to what you do. The private parts are also censored.
Over all the game is linear and simple yet interesting enough because of the sexual aspect.
Here is one of the few links I found with screenshots
http://shop.himeya.com/products/adul...ko3/biko3.html (NSFW)
Cheers.