Hibiki focused on security hardening and configuration hygiene for the traPtitech/manifest repository, delivering a targeted update that removed hard-coded user references from deployment configurations. By eliminating the user 'hijiki51' from operator lists, Hibiki reduced the blast radius for deployment operators and tightened access controls, directly addressing potential misconfiguration risks. The work was implemented using YAML and leveraged skills in Configuration Management, DevOps, and Kubernetes. All changes were reviewed and passed continuous integration checks with no regressions, reflecting disciplined change management. This update improved deployment command simplicity and contributed to a more secure and maintainable configuration environment for the project.