Zilbagias 5 When?
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I no good at Internet.
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The standard response is here.
Volume 5 has been released in Japan, 9/25/2024.
That's after JNC did the initial license negotiations, so it'll be a newish discussion with Overlap (the Japanese publisher.)
JNC is very good about keeping a series going, but they very rarely say anything prior to announcing that pre-publication posting will commence.