月刊少年Ace
is a six-volume manga series written by Yoshiyuki Tomino and illustrated by Yuichi Hasegawa, first serialized in Kadokawa Shoten's "Shōnen Ace" magazine from December 1994 to March 1997. A sequel to the animated theatrical film "Mobile Suit Gundam F91", "Crossbone" has been officially distributed in Japan and Italy only.