Heiji leaned against the surface of the table. "Well, if we are, I don't think our captors are Japanese. See, we ain't come across one puzzle specific to Japan. It's all Western stuff, like art galleries and them jail cell setups. I guess Zero could be a big fanboy or somethin', but..."

Yeah, he would have thought there would have been at least one reference to warlords or kanji or hiragana if they were in Japan.