When she was a student, Kanako was dating her classmate Kosuke.
Ten years later, Kanako, who married Kosuke and had her only daughter, Aina, was not wealthy, but the three of them were living happily together.

Due to the misfortune she caused, he came back with a secret from 10 years ago.
"Hey, senior, to a woman who has become a married woman again after 10 years... Don't you think you'll get excited?"