High school student Shintaro Tokumitsu lives alone, studying and working by day and living a lonely existence at home at night. However, his life changes when one morning, he wakes up to find a girl fast asleep on his apartment balcony – and when he discovers that Towa is a literal angel sent by God to study mankind (and repay Shintaro’s kindness by bringing happiness into his life), things will clearly never be the same.