During May 2025, Marble Snow developed onboarding documentation for the Koumori lecture series within the chrom9103/PiPi_Git-intro repository. Focusing on repository health and future scalability, Marble Snow created a self-introduction file in Markdown, ensuring the structure could accommodate additional lecture content and streamline instructor onboarding. The work demonstrated proficiency in documentation practices and Git workflows, with attention to localization through Japanese-language commit messages. While the contribution was limited to a single feature and did not involve bug fixes or complex engineering challenges, the effort provided a clear foundation for future content and maintained a clean, organized repository structure for collaborators.