We’re very sorry for the trouble caused by issues in the previous update.
Thank you to everyone who reported the problems and took the time to contact us.

When you stored items in the Memory Chest, the Twin-Star Spirit Stone allowed items to contain other items. As a result, data for items that no longer existed in your bag was still being preserved, causing the save file to bloat and putting extra load on the game whenever items were retrieved.
We have narrowed down which items are saved and fixed these related bugs, but we will keep monitoring cases where a large number of item enhancements might still cause issues.

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If the UI or other elements look broken after launching the current version
Go to your Steam installation directory:
steamapps\common\Lys and Ruka's Magical Bag\save

Rename itemsave.dat (for example, to itemsave_backup.dat) and start the game again.

This will let the game start normally, but unfortunately item–related data will no longer load. We apologize for the inconvenience.
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We released this update to improve the situation as quickly as possible and will continue working on further fixes.
Your cooperation and feedback are greatly appreciated if you encounter any issues after launching the game.