Yota is a high school boy who loves sweets and fried food. His lunch at school usually consists of pastries or fast food. How can he change his unhealthy eating habits!? After Yota's parents decided on an arranged marriage for him, a hand-made bento box came unexpectedly from his fiancee. When he ate the bento, it tasted better than anything he's ever eaten… He has never met her, he doesn't even know her name, but his secret relationship with his mysterious fiancee has begun.