From MangaPlaza:
Mami has tried marriage once and failed, so now she's looking for something else. Even if her peers won't get it, she wants what she wants: not marriage, not romance, just a man to spend time with when she needs some company!
Sure enough, when she brings this up at her junior high-class reunion, her friends all gang up against her. However, a handsome former classmate she'd almost never spoken to before--Nakamura--does empathize with her! When Mami learns that Nakamura is also once divorced and, just like her, is looking not for a wife or a girlfriend but just a woman to spend time with, she makes a life-changing decision. She's given up on living her life according to what's "normal."
After spending thirty-some years toiling under the crushing weight of societal expectations, one woman finds herself a partner in crime and a new lease on life in this modern-day survival story.

Official English