30 Ban ~It's a love that is refused when under 30 years old~

Moriyama Shino is a 30-year-old office worker who is thinking about getting married. Shino has always wanted to find a man who is around the same age but she received a sudden confession from Sato Mayuki who is 9 years younger. Shino then agrees to go out with Mayuki but only until "when she finds her marriage partner".