Koichi Hirose's Mother
She is the wife of Mr. Hirose 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.
Mrs. Hirose has dark, wavy hair styled as a pixie cut swept to the side. She has moderately thick eyebrows that are slightly arched upwards, and she is always seen with lipstick.
During her encounter with Tamami Kobayashi, she wears a striped blouse, a skirt, and slippers. The blouse's collar has a triangular brooch with a heart on it. When she goes shopping later on, she is wearing a long-sleeve blouse, a vest, and pants. She also has earrings on.
Koichi's mother is a cheerful, lively woman. She is welcoming to visitors, seen being open to conversation with Tamami and defending him when Koichi rushes in. In general, she is cordial to strangers and gets along with them well.
She can be somewhat gullible as she believes what Tamami tells her, even when he has to correct a lie about talking to someone with a broken jaw. Although initially succumbing to his manipulation to the point of wanting to commit suicide, her love for her son, who she affectionately calls "Ko-chan," triumphs. In her heart, she trusts her son over anyone.
Mrs. Hirose is greeted by Tamami, who makes up a story about how he kindly found the 7,000 yen that her son dropped and wanted to bring it back to him. She lets him into her house while they wait for Koichi to come home from school. As Koichi returns, he finds Tamami massaging his mother's shoulders and praising her with fake compliments.
Tamami claims that when Koichi bumped into him with his bicycle, they accidentally exchanged wallets and that his contained over 500,000 yen. Tamami adds weight to his accusation by commenting that the wallet in Koichi's possession contains a bill from a dinner he had the night before, and to Koichi and his mother's surprise, the bill is indeed in the wallet. Tamami asks Koichi's mother whether she feels guilty for raising such a trouble-making son, and despite Koichi's protest, The Lock appears on her chest. Tamami tells her that he won't be satisfied with 500,000 yen alone and may also take the house's mortgage, taunting her that it's the woman of the house who usually takes care of these things. Koichi's mom and Ayana are pushed out of the room while Koichi confronts Tamami.
After a loud scream from Tamami, she runs back into the room to find him bleeding with the knife in Koichi's hand. Unaware that Tamami had actually cut himself in order to frame Koichi, The Lock on Mrs. Hirose's chest multiplies in size due to her guilt. Koichi's mother cannot bear her guilt and takes out a knife, preparing to stab herself with it. Tamami orders Koichi one last time to stop the sound, but he answers that he won't stop, but emit another sound. He shouts "Believe me!" toward his mother, imprinting the sound on her with Echoes. The sounds make her realize that she has to believe her son, and her guilt disappears.
Mrs. Hirose and Ayana are out shopping when they stumble upon Koichi and Rohan. Surprised to meet a famous mangaka, she calls him amazing and requests to come with them to Kameyu Department Store. Yukako is frustrated that of all people, Koichi's mother had to show up because she had hoped to be alone with Koichi. They also meet up with Josuke and Joseph along the way. While at the store, the flash of Rohan's camera startles Shizuka. Joseph panics and rushes through the crowd as the baby starts turning invisible, which surprises Mrs. Hirose.
In the anime adaptation, she and Ayana are outside Kameyu when Ayana tells her that she just saw Koichi holding hands with a really pretty girl. Mrs. Hirose is shocked because Koichi never told her anything.
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