Story
After the body dies, the soul lives on. Many spirits progress toward the world of light, through the levels of the spirit world where they study how to improve their souls. These spirits are sometimes reincarnated into the physical world, and sometimes they are sent back as guardian spirits for other living people. Guardian spirits must protect their charges souls from the blackness that oozes up from the world of darkness below. Riyon is a very laid-back spirit, who often skips her spirit classes to fool around.
Synopsis via AniList (English).
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