Japanese top 3 manga publishers and the major printing company DNP acquired 28.9% of Bookoff Corp. stocks. The three publishers; Kodansha, Shogakukan. and Shueisha have been opposed to Bookoff because the company is the largest dealer of the secondhand books and the manga market is severely affected by their business.
Bookoff official website (English)
The investors explained the intention of the acquirement of the stocks that they will rebuild the book market system including the used books in order to maintain the growth of the industry and to protect the copyrights.
Akamatsu Ken said:
In the recession of the publication industry, a company accomplished 20% increase in the income. It's Bookoff (lol). I have received lots of well-meant letters from the fans saying "I bought all the volumes of Negima! at Bookoff. I'm supporting you!". (hallelujah!) I guess it's ordinary for them.
Source: Akamatsu's diary (March 15th)