31-sai, Hatsukare.

Shiina Fuuka is a 31-year-old woman who has never been in a romantic relationship and feels pressure to marry, particularly from her mother. She struggles with new experiences and considers herself plain and unremarkable in her office job. After a disappointing encounter with a man from a marriage site who deceived her, she meets a bartender later that night and ends up spending the night with him, losing her virginity. While she is unsure about the details, she sees this as a way to move forward in her personal life. She is determined not to wait any longer and is ready to explore love for the first time at her age.