Some maps lead to places that shouldn't exist. For five years, Aya Mizuno has lived without dreams, building her life around careful routines that protect her from the grief of losing her sister. Her days are measured in precise tea ceremonies and meticulous map restoration at Tokyo's National Museum, where she preserves other people's journeys while avoiding her own emotional landscape. Then she wakes to find an impossible map on her desk—drawn in blue ink she doesn't own, depicting a city that exists nowhere in the real world. That same morning, an elderly woman arrives at the museum, describing a dream identical to one Aya can't remember having but somehow knows she lived. Night after night, Aya finds herself experiencing other people's lives through supernatural dreams: a grieving mother desperate to preserve her daughter's voice, a violinist haunted by choosing career over family, a businessman who built success on emotional isolation. Each dream leaves behind another impossible map, and each map guides these strangers toward healing they couldn't find alone. But the gift comes with a terrifying price. With every person she helps, Aya loses more of herself—her memories replaced by foreign experiences, her identity consumed by an ancient entity that feeds on unprocessed grief. As the boundaries between her consciousness and others dissolve, she must uncover the truth about her sister's disappearance and confront the supernatural force using her compassion as a weapon against her own survival. A haunting exploration of grief, identity, and the maps we draw to navigate loss, this psychological fantasy reveals that some territories of the heart can only be crossed by those brave enough to face what they've spent years trying to forget.