From a message board . . . Make of it what you will.
“It’s a gang group calling themselves “Chinese Dragon.” They were holding a party for one(s?) just released from prison.
Their background and cultural heritage are a bit complicated. The group members are Japanese nationals, the second or third generations of Japanese war orphans who were abandoned and raised in China at the time of war end. Those orphans as well as their kids were born and growing up in China, some may be “half” with Chinese and Japanese parents, and accompanied their Japanese parents going “home” to Japan. Many are unable to speak Japanese.
Though the former war orphans’ (mal-) adaptation had already been addressed, the acculturation issues for their offspring are rather new and overlooked.”
That's a plausible explanation, and it would also explain why the information was not in the Kyodo story, since it would be admitting what we all know, that to a Japanese, one is either 100% Japanese and non-burakumin, or an outsider.
Thank you Blurb, that explanation makes sense.
Gang fight.