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Most files are rewarded as you reach certain wave thresholds in Survival Mode (e.g., Aki's file at wave 5, Makoto's at wave 20).
These are core story flashbacks that follow the "Gray Christmas" event, essential for understanding protagonist Kou’s lost memories.
Based on community data from the Steam Community, here are typical unlock milestones in Survival Mode: Secret File: Aki Wave 10: Wallpaper: Kou/Rain Wave 20: Secret File: Makoto Wave 35: Secret File: Sora Wave 100: Final Gameplay Unlocks/Wallpapers baldr sky secret files
Once unlocked, these files can be viewed directly from the Main Menu . How to Unlock Secret Files
While earlier files are easy to obtain, later ones may require reaching Wave 100 to fully complete the collection. Most files are rewarded as you reach certain
The Secret Files are a collection of supplemental scenes that provide extra character interactions and background details not integrated into the main plot.
If you tell me which you are looking for, or if you need a guide for a specific Survival wave , I can provide more detailed tactics. Reddit·r/visualnovelshttps://www.reddit.com How to Unlock Secret Files While earlier files
The patch restores uncensored CGs and specific intimate scenes that the developers originally intended as "bonus rewards" for players. Secret Files vs. Reminiscence
💡 If you find Survival Mode too difficult, you can lower the difficulty in the settings; most unlocks are tied to the wave number , not the difficulty level.