On New Year's Day, my dad called me home to introduce me to my stepmother after he decided to remarry. After that day, I also decided to go to the city to find a job to become independent. Coincidentally, while looking for a place to stay, I ran into Airi Kijima, my first love from my college days, who is also my friend's sister. I was very happy to see her again, but also very sad to find out that she had married a classmate from university, whom I also knew. Later, she invited me to her house, and despite my numerous refusals, her enthusiasm made it impossible for me to decline. Little did I know that those days staying at her place would be the best days of my life.