Title: Niji no Kanata ni
Original title: 虹の彼方に
Length: Very short (< 2 hours)
Year: Japan 2006-06-03, English Patch 2010-08-29
Developer: #define
Publishers: #define
Language: English
Voice: Japanese
Translation: Tengu Translations

Description:
Miku is 19 years old, and she's confined to a hospital bed since her seventh birthday because of a nasty disease that ruined mind and body alike.
But now even her hospital doctor and therapist cannot stand anymore to simply watch the pain of her existence: thus...

Important:
1. You need to change locale to Japanese.
http://erogedownload.com/faq/changing-to-japanese-locale-on-windows-7/

2. No need to install.

Screenshots: