19-year-old university student Rina moves into a suspiciously cheap apartment in Setagaya-ku to study at Shinsei University. It's quiet, clean and oddly soothing. Soon she notices how emotional pain disappears overnight when she cries, screams or is heartbroken. The apartment seems to swallow up her negative emotions. At first it's a miracle. But then... Her memories become increasingly hazy, her reactions dull, she begins to feel nothing even in moments that should shake her. And it gets even worse: the more unfeeling she becomes, the more others in the building feel things they shouldn't - panic attacks, inappropriate guilt, phantom grief. And slowly, this phenomenon seems to be engulfing her completely.