JUSTSYSTEMS Corporation (Headquarters: Minato-ku, Tokyo; President and CEO: Kota Sekinami) announces the launch of 'ATOK MiRA' (Eitokumira), an AI-powered writing assistant, for macOS, Android, and iOS as part of the 'ATOK Passport' service—providing continuous access to the latest Japanese input system—starting today, June 29 (Mon). ■ 'ATOK MiRA' Now Available Across 4 Operating Systems, Enabling Use from Any Device With support across Windows, macOS, Android, and iOS through 'ATOK Passport', the writing assistant 'ATOK MiRA', previously available only for Windows, is now accessible on all four operating systems. This enables users to leverage the writing assistant across all devices, including PCs and smartphones. 'ATOK MiRA' combines ATOK's Japanese language processing technology with generative AI tailored to individual input patterns, offering personalized and natural text suggestions. Without needing to launch a separate app or enter prompts (instructions), users can simply invoke the feature via the 'ATOK MiRA icon' and select predefined commands such as 'Refine Text' or 'Add Emoji' to easily generate ideas, edit, summarize, or rewrite text. ■ Enhanced Conversion Performance for Fragmented Input on Mobile Devices The conversion engine for Android and iOS has been upgraded. Optimized for the smartphone-specific input style of confirming words individually while viewing predictive suggestions, the update improves conversion accuracy for fragmented input starting with particles and for words containing附属 elements (e.g., auxiliary verbs). For example, previously, after confirming '経験' (experience), typing 'のうむ' next would be processed independently and incorrectly converted to '濃霧' (dense fog). The new engine correctly interprets such fragmented input in context, converting it accurately to '経験の有無' (whether or not one has experience) in a single step. Additionally, conversion accuracy for common daily expressions containing附属 elements like '〜たい' ('want to') and '