While looking for content for the blog recently I came across a mange series which I had never seen reference to on fansites. Beginning in the first issue of Super BonBon in May 1986 "Transformers 2010" had a feature manga with the first issue featuring a Mini Rodimus fulfilling a legend to defeat a monster, which in this case was Predaking. I have managed to get a copy of this first issue but i am not sure how many where released overall. Through my research i have found that a few where released including one that features the Japan only Headmasters in a prominent roll.
You can look at the first issue using the link below: