User blog comment:Oppaichan/Discuss changes and corrections/@comment-7948498-20140415050827

Where can we check official information on the story and characters? I noticed that editors have made changes to the birthdates of the characters a lot, many of the new birthdates far different than the previous. If somebody made a mistake, how can they be so far off? Or is somebody intentionally putting in the wrong information for whatever reason?

Where can we view the official guidebooks of the manga to confirm?