The story revolves around childhood friends Satsuki Satonaka and Takumi Kusuki, focusing on a dynamic where Satsuki teasers Takumi, with the premise escalating when she discovers a "porn booklet".

| Element | Description | |---------|-------------| | | Each lantern— mesu (eye) + dachi (stand)—embodies a single memory or emotion. They drift in the sky like fireflies, glowing brighter when recalled. | | The Veil | A thin, shimmering barrier separating the physical realm (the Kumori cities) from the Yūgen sky where lanterns float. Crossing it requires a “memory key.” | | Memory Keepers | Humans (or spirits) who can bind, release, or reshape lanterns. Their tools are ink‑brushes that draw new pathways for light. | | The Null Zone | An area where lanterns go dark and fade, causing “blank spots” in history—an ever‑expanding threat. | | The Archive | A colossal floating library where the oldest lanterns are stored. The Archivists are ageless guardians who speak only in riddles. |

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