Sega Corporation has initiated legal proceedings against Bank of Innovation, the developer of the mobile game Memento Mori, alleging infringement of five patents. The lawsuit seeks damages amounting to ¥1 billion. Sega claims that the infringed patents are related to gacha mechanics utilized in both Memento Mori and another game, Genjū Keiyaku Cryptract. This lawsuit follows a recent patent enforcement campaign by Sega in the U.S. and Europe, coinciding with ongoing litigation involving Nintendo and the developer of Palworld. The case highlights the growing scrutiny of game mechanics within the industry, particularly concerning patent rights.