I mean the author of the manga. But, now that I look, the only mention of Tsubasa I can see is in the Pop Culture References section, which states that the beginning of episode 5 is a parody of Captain Tsubasa. The way it reads currently, it is definitely synthesis, but if it's true, there's bound to be a reference (probably in Japanese) confirming it. If none can be found, though, it will eventually have to be removed, and I personally question why it merits mention in the first place anyways - it seems very trivial to me. 「[[Special:Contributions/Dinoguy1000|千？！]]」? · Talk⇒Dinoguy1000