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Hikaru Utada goes by Hikki, and Cubic U.
Hikaru no go - 2001 is rated/received certificates of:
South Korea:12
It depends. Are you talking about what age, what volume....?
Nope. Hikaru no Go has 75 episodes, 76 if you count the New Year TV special.
You can read the Hikaru no Go manga at any store that sells books, like Borders or Barnes & Noble.