When Tenhou and Chihou get mentioned and you know what they're 'cause you've read Ten, Akagi, Kaiji and other stuff from Fukumoto-sensei.
That's culture.
Well...
I seem to remember that in Secret of Blue Water there was a character connected to a cord of sort...and then they used it in Evangelion as the cord that powers up the mechas.
I guess. 'been too long ago.
I'm glad you liked it. Manga like this are a niche genre and often pass under the radar, unless the author who is featured is someone very famous.
Back in the day I think I had translated everything that Adachi had drawn up to that point (and no scanlators were doing) and his old manga no one...
Men with thick eyebows everywhere. I approve.
Also, that net Azumi puts in the rooms is a kaya, a mosquito net, and its function is that of, goodness, keeping away the ferocious japanese mosquitos from biting you.
I forgot to put a note about it.