In a world where black rain falls, a girl named Pieta leads an ordinary life. As usual, the rain pours down, and she walks along the familiar path to school, enjoying conversations with her friend, Danai. Pieta, who spends her days in this 'ordinary' way, finds happiness in those very moments of normalcy. That day, she was supposed to enjoy another conversation with Danai— "But why! Why does Pieta remember what happened yesterday!?" A slightly dark, cyclical daily comedy begins.