- Author: 河口洋一郎?かわぐち よういちろうAuthor Record # 314072
Kawaguchi Youichirou - Birthplace: Tanegashima, Kagoshima, Japan
- Birthdate: 1 April 1952
- Language: Japanese
- Webpages: Wikipedia-JA
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Cover Art
- Brain Valley (上) (1997)
- Brain Valley (下) (1997)
- Brain Valley (上) (2000)
- Brain Valley (下) (2000)
- Brain Valley (上) (2005)
- Brain Valley (下) (2005)