Kaede Hinata's parents win an overseas trip in a lottery in the shopping district. During spring break, he will be home alone with his older sister, Tsubasa, and younger sister, Ran. Both sisters decide to take this opportunity to train the weak protagonist in an effort to teach him how to be a man. He has always been put upon in various ways and has been strained both physically and mentally, but he soon shows some promising changes.

The relationship between the three siblings becomes even closer, and the happy days pass until their parents return.