I've finally gotten to read volumes 18 and 19 of the manga, spanning Tokyo Select's match with the Korean team and the start of the Japan Toresen (about which all I can say is, OMG OMG plot development!).
In volume 18, though, the little four-panel gag strip at the end of Stage 155 alludes to "Daisuke Higuchi's collection of short stories, Break Free". (The strip also implies that Tatsuya is featured, possibly embarrassingly, in said collection. This I want to read!)
Does anyone know if this compilation has been scanlated? I don't know if Viz is likely to release it at all... ::worried look::