Sugunaku Onna ni Kikanjuu

A coworker who keeps chasing after teen idols despite her age; a useless boss; and a completely unsociable new hire. Ann, a fortyish woman who looks down on those around her and blames everything on others, dreams only of marriage with the boyfriend who won't sleep with her. But then one day, when she learns that one of the colleagues she looked down on is getting married, she reveals her hidden nasty side right in front of the newbie. From that day on, she is visited by one misfortune after another.... (Source: Manga Plaza)