That explains why his twitter account was so silent. He was drawing a oneshot while working on his regular serialization with one volume due only 2 months after the last one,
About the title: Kichijōji is a neighbourhood in Tokyo https://en.wikipedia.../wiki/Kichijōji
Personally I'd translate it as Kichijōji Boy, but we'll see which translation fits better when the oneshot is out. If it won't be something else, because it's noted that the title is subject to change.
The small blurb says:
The No. 1 town where people want to live... But until only a few decades ago it used to be infested with demons.
A furious and (???) "boy meets adventure" story from the powerful mangaka Syun Matsuena, author of HSDK and Kimi wa 008,
I can't read the kanji for (???), because the image quality is too bad. It could be 懐かしい (nostalgic). In any case it's another adjektive.
I'm totally looking forward to seeing more of Matsuena's monster designs. Can Kanata from TK!! get a cameo, please?
https://gekkansunday.net/ says new issues always drop on the 12th of each month. Issue 06/2019 will be out in two days. That means we'll get to read this new oneshot on July 12.