Fujimiya Amane, a high school student, lives by himself in his apartment. Next to him lives Shiina Mahiru, the prettiest girl at school. Someone who everyone calls "an angel." They never really talk, but when Amane lends Mahiru his umbrella on a rainy day, their relationship starts to blossom. Before long Mahiru finds out that Amane neglects his cooking and cleaning, and she feels obligated to step in. Although they have zero interest in one another, they slowly find themselves growing closer... This is the bittersweet love story of a young man and his beautiful, sharp-tongued neighbor.