Direct answer
Japanese interface and subtitles are listed, but Japanese full audio is not currently marked on Steam. Only English and Simplified Chinese are presently shown with full-audio support.
What is not confirmed
This answer is intentionally limited to what the cited primary source establishes. It does not rely on fan-maintained lists, retailer placeholders, edited trailer cuts, leaks, or assumptions imported from other action RPGs.
How this answer will be updated
The page will be checked after the dedicated summer State of Play, material store-page changes, and the retail launch. New details will be added only when they answer this exact question; separate search intents will keep their own URLs to avoid overlap.
Primary source
Official Steam page, last checked July 31, 2026. The linked beginner hub provides the surrounding guide context.