Kouichi's Mother

Kouichi Hirose's Mother is an unnamed tertiary character featured in the fourth part of the JoJo's Bizarre Adventure series, Diamond is Unbreakable.

She is the wife of Kouichi's Father and the mother of Ayana Hirose and Koichi Hirose. She is tricked into believing Tamami Kobayashi's lies about her son, causing her guilt to amplify due to Tamami's Stand, The Lock.

(Source: Jojo's Bizarre Encyclopedia)