In a city where death leaves behind "shards" — extractable memory fragments — Yui Kagami is a young Archivist trainee who catalogs the dead and follows four simple rules: don't judge, don't dig, don't listen too closely. But when a routine extraction turns up a "dead" boy very much alive on the street, and his file gets sealed at Director-level clearance, Yui starts breaking her own rules. Some echoes weren't meant to be heard — and some names weren't meant to be found.