Silver Spoon Is Shogakukan's Fastest With 1-Million 1st Printing
The fourth volume of Hiromu Arakawa's Silver Spoon manga will have a first printing of one million copies. It has been only one year annd three months since the manga launched — the fastest that any Shogakukan manga has reach that million-copy milestone. There are only a few manga series from any company — notably, One Piece and Naruto — that also have first printings of one million or more. For Arakawa, Silver Spoon is her second manga to accomplish this feat, after Fullmetal Alchemist.
Source: Mainchi Shimbun's Mantan Web