Kore ga Saigo no XXX Kamo

The series is an omnibus series that "realistically" tells stories about the sexuality of women in their 30s. One of the stories follows 35-year-old Mikako Sano, a single woman who hasn't had a boyfriend in 10 years. While she isn't desperate to settle down, she soon meets a flirtatious businessman named Hashimoto, who prefers to be alone, and she becomes interested in him.

(Source: Anime News Network, edited)