Saya is an average schoolgirl in every way but one; she's got a HUGE crush on her older brother. She's never been able to raise any flags with him (mostly due to her habit of beating him to a pulp whenever she sees him), but one day, she wakes up in the body of a cat that he brought home! Could this be her chance to make her beloved older brother fall for her?

This is a story of a 29-years-old bachelor who was brought to a different world to live freely. Caught by an “unwanted” wife from day one, his life is not going so smoothly when the entire country focuses its attention on him in ten days. Without losing to such an obstacle (?), he will continue to live on.