A 30-year-old unmarried woman named Shino Moriyama feels the pressure of time passing and believes it's important for her to find a husband soon so she can start a family and have children. One day, Mayuki, who is 21 years old, confides in her. Despite this, Shino continues dating him but only until she meets someone her age and gets married.
30-kin has been licensed in German by Altraverse.