Rinne's disability isn't tragic backstory, it's her actual lens on the world, which means every revelation about what's happening around her lands differently than it would for you. Jugemu shows up to save her and never explains himself, so the entire show becomes an investigation into whether you can trust someone who operates on information you don't have access to. The bond they form isn't romance or mentorship; it's two people learning to navigate worlds that are actively ending, one unanswered question at a time.

Rinne cannot see the faces of other people. She comes from a family whose work is exorcising supernatural beings, and when she heads out on her first mission, she runs into a foe far stranger than she anticipated and ends up in danger. A mysterious man called Jugemu rescues her, and from him she learns that every world, her own included, is part of the Strike Worlds, and all of them are under threat. Rinne travels with Jugemu through one world after another as each nears its end, and along the way the two grow close. The series is an action fantasy.