Koikatsu & Koikatsu Sunshine
Free. Made by someone who got fed up with the whole scenes and cards folder mess.
Local app. Portable ZIP. No account. No telemetry.
Current release
Windows SmartScreen may warn on first launch. No malware.
* Card feature is not available yet, sorry. m(_ _)m
Main window: scene grid, search, tags, authors, and
inspector
What is it
If you have used KK or KKS for a while, your collection is probably a mess: nested folders, vague names, duplicate downloads, repeated saves and a lot of files you don't even remember anymore.
KK Library is a local desktop app that helps scan those folders, show what is inside, find duplicate or similar content, fix tags and author names and reorganize files easily.
| Price | Free. Forever |
|---|---|
| Supports | Koikatsu and Koikatsu Sunshine (but not required) |
| OS | Windows 10 (x64) and Windows 11 (x64) |
| Size | ~100 MB (~44Mb zipped) |
| Free space | At least 150 MB for the app itself |
| Installation | Not required. Portable ZIP |
| Network | Not required (unless you want to) |
| Languages | English and Japanese |
Find scenes across your folders
Browse, search and inspect scenes without opening the game.
Main library view and folder scanning result
Find duplicates and similar scenes
This is likely what you have been looking for. Find and get rid of all those duplicated scenes or variants without losing what is important to you.
Exact duplicates and similar-scene review
Tags, ratings, favorites and all that
Add the information your scenes usually do not have, so you don't have to open them every time to check.
Tags, ratings, favorites, and author cleanup
More tools
Sort scenes into a cleaner folder layout. You see the move plan first, then apply it.
Send a scene straight to CharaStudio, without digging through the in-game loader.
Mark scenes Safe or R-18 and blur previews.
Panic button (esc) hides everything and minimize.
Tags, ratings and authors are tied to the scene itself, so they survive moves and re-packs.
Select a pile of scenes and tag, rate, or fix the author on all of them at once.
Built for oversized, messy libraries: thousands of scenes stay quick to browse and search.
F.A.Q
It's safe, it's just not code-signed. A signing certificate costs money every year and this is a free side project, so Windows SmartScreen flags it the same way it flags any small unsigned app. Choose "More info → Run anyway" to start it. If you want to be sure first, check your download against the SHA-256 on this page. Since the app is portable and offline, you can run it from a throwaway folder or a VM and watch what it does.
It does not touch your mods or saves. The one thing it adds to your Koikatsu folder is a small bridge plugin (in BepInEx/plugins), installed when you connect your game so "Open in CharaStudio" can work: it sits alongside your other plugins and changes nothing else. If you never connect the game, it does not write there at all.
No. It can scan and manage scene files on a PC that does not have the game at all. You only need Koikatsu installed for the optional "Open in CharaStudio" button.
Scanning only reads, it never changes your originals. The only changes are ones you trigger yourself: deleting moves scenes to a Trash you can restore, and reorganizing shows you the whole plan first and can be undone. If something looks wrong, it is recoverable.
No account, no telemetry, and nothing about your files leaves your PC. The one exception is an optional update check: on launch it can fetch a tiny file to compare version numbers (nothing about you or your library is sent) and you can turn it off in Settings.
When a newer version is out, the app shows a small note with a download link. You grab the new ZIP and replace your old folder (Your settings and data stay where they are). Nothing installs or updates itself in the background.
It is portable, so there is nothing to uninstall: delete the folder and it is gone, with no leftovers. To carry your work across, export your tags, ratings and authors to a file and import it on the other machine (or after a re-pack).
