If you have already downloaded the game, you need to re-download the archive from your DLsite library. Here is the official changelog based on the creator’s support page:
A Complete Soundtrack was released on Bandcamp in January 2025, which includes all 20 tracks from the game, including battle and title themes. kagami no inma to akuma no tane rj01264927 updated
The update adds fresh visual content and story branches for primary characters, deepening the interaction paths available to the player. If you have already downloaded the game, you
: Refinement of the "Devil's Seed" mechanic, allowing for deeper customization of the protagonist's demonic abilities and passive growth. kagami no inma to akuma no tane rj01264927 updated