https://www.dlsite.com/maniax/work/=/product_id/RJ01254057.html
https://www.cmoa.jp/title/305024/

[Synopsis]

One day, Shio's mother suddenly introduces her to a strange man, telling her she's getting remarried.
Though she doesn't want to, she accepts it for her mother's sake.
However, a year later, Shio is repeatedly violated by her stepfather and when her mother finds out, she abandons her without offering any protection.
She begins living alone in the old apartment she was forced to live in.
Her relief at escaping her stepfather is short-lived, as she is then violated by the ghosts that inhabit the apartment.
At first, it feels so surreal that she can't believe what's happening to her...
Confused, Shio becomes immersed in the sexual pleasure she's never felt with her stepfather.
But she soon understands.
''When will this end...?!''
Shio is worn down by the daily rapes and then, as if to add insult to injury, her stepfather returns and violates her again...
In her despair, the brief glimpse of hope she had, however, is an illusion...
She is violated relentlessly and though she feels pleasure, the pain soon overcomes it.
In a room in the old apartment, unnoticed and unhelpful, she has only one wish:
"I just want to relax..."

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