Daijin is a container management tool designed for Android devices running Termux. It provides a menu-driven interface to create, run, remove, and manage Linux containers using either the ruri backend (a lightweight container implementation) or proot (a chroot alternative). The application orchestrates container lifecycle operations by integrating with submodules rurima (for running Docker/LXC images without Docker/LXC) and rootfstool (for obtaining container rootfs from mirrors). Key functionalities include downloading container images, setting up container environments with proper permissions and networking, managing container configurations, and providing launch mechanisms. The architecture is monolithic with modular shell scripts handling specific operations, all built as a Debian package for Termux deployment.