So this is a series of books right? Because there are three novel volumes on the wicked city page so i am curious about how many books are in the series.
Also WEE! more Hideyuki Kikuchi to read! So cool that this is coming out a month after A Wind Named Amnesia/Invader Summer.

There are a total of 11 books in the series to date. We are getting the first three, obviously:

妖獣都市Wicked City / 3 volumes

These were followed by:

凶戦鬼（妖獣都市異伝）Wicked War Demon (Wicked City Spin-Off) / 1 volume

妖獣都市《ニューヨーク魔界戦》 Wicked City: New York Demon Realm War / 2 volumes

妖獣都市 魔獣児 Wicked City: Demon Beast Child / 1 volume

妖獣都市 雪洞鬼 Wicked City: Snow Demon / 1 volume

妖獣都市 魔王眼 Wicked City: Demon King's Eye / 1 volume

妖獣都市 海死記 Wicked City: Sea Death Chronicle / 1 volume

妖獣都市 黒天使 Wicked City: Black Angel / 1 volume

I don't speak or read Japanese so those English titles are just guesses made by way of an online automatic translation website. There are most likely mistakes.

The obvious question would be if there are any plans to translate the rest of the books in the series or maybe even other horror novels by Kikuchi and the obvious answer is that it's too early for an answer. The only thing that's guaranteed is that unless the first three books sell well, there won't be any follow-ups. Remember that originally there were only plans to publish the first three Vampire Hunter D books in English but because they sold very well we're now up to 12 (!) volumes in English. The publisher has done its part, now it's up to the fans to put their money where their mouths were.