Thread:Nagumo baby/@comment-124.253.54.253-20130309110150/@comment-3200351-20130310194703

It actually says "another story" (Kanji: もうひとつの物語  Katakana: アナザーストーリー) which is a synonym of gaiden. "another story" is a loan word of sorts from English but I don't think the term is actually used in the west. The "another" part refers to a story taking place in "another world" i.e an alternate universe.