From JManga:
Rich, pretty, and free-spirited Ranko Gekkouji may be a widow, but she's hardly wasting her days in mourning! Blessed with wealth, beauty, and adorable children, the envy and jealousy of others overflows - but that won't stop her from doing what she wants. For when she's not horrifying her mother-in-law by frolicking with her younger boyfriend, or having a fairly lax attitude toward parenting her teenage children, Ranko uses her all to solve cases, bringing her own brand of justice to the selfish, the vain, and even the evil killers who dare to cross her path.