Item from Re:Zero by Tappei Nagatsuki
Subaru's curse and salvation — when he dies, time rewinds to a checkpoint. He remembers everything. He can tell no one. The Witch of Envy's love letter, written in his suffering.
Return by Death is not a power. It's a punishment that happens to look like a second chance. When Natsuki Subaru dies, time reverses to a predetermined save point — a checkpoint he cannot choose, cannot predict, and cannot control. He retains all memories from the erased timeline. No one else does. The people he watched die don't remember dying. The conversations he had, the bonds he built, the promises he made — all erased. Only Subaru carries the weight of every failed timeline. The rules are cruel and precisely calibrated. If Subaru tries to tell anyone about Return by Death, shadowy hands materialize and crush his heart — or worse, the curse targets the person he's trying to tell. Satella, the Witch of Envy, enforces this silence personally, appearing in a cloud of shadow and obsessive love whenever Subaru pushes too hard against the restriction. The ability forces Subaru into complete isolation with his trauma: he can save everyone, but no one will ever understand the cost. It's the loneliest power in fiction, and the series never lets him or the audience forget it.
Also known as: Return by Death, RbD, the curse, death rewinding