This is the game

Genre: History, Visual Novel, RPG, Tactic, Hentai
Language: Japanese with English Patch
File Size: 1.2 GB (uncompressed)
Format: .ISO (DVD-ISO) splitted on 10 rar parts

Downlaod all the parts to one folder and extract with winrar or 7zip.
Total compressed size (all parts together) : 906 mb
Readme:
1. Download all parts, then extract it with Winrar
2. Mount "UTAWARE_DVD.iso" with Daemon Tools
3. Run the English Patch and follow the Instructions to install the Game
4. Keep the DVD.iso mounted and just run the game from the desktop icon or startmenu to play it

System requirements:
1. Windows 98/ME/XP with DirectX 8.1 or higher installed
2. Pentium III 500MHz or more
3. 64MB RAM or more (128MB or more recommended for 2000/XP)
4. 640x480 resolution, Full Color (at least 1,6770,000 colors)
5. 1.65 GB free hard drive space or higher
6. DirectSound or compatible soundcard.
7. DVD-ROM drive, at least 2x read capability
8. Mouse and keyboard