Asahina Tamako, a cosmetics company worker, is nearly 30 and still unmarried. In fact, she hasn't even been in a relationship in 8 years! She's developed a crush on her company's security guard, Takeda-kun, but he's 22. Would he really go for an older woman like her? One day, as Asahina's working overtime and Takeda's patrolling, the two find themselves alone in the office. And then…!?