Goshujin-samania

Seven years ago, her father died.
One year ago today, she lost her mother.
Mitsuki faked an illness to sabotage the memorial service.
She dumped all responsibility on her younger brother Yuki
and sought an accomplice to fulfill her destructive desire.

Online, she met a man who called himself Asami.
As they fornicated in sadomasochistically
she frantically tried to escape... something. Her constantly tortured self.

A father dead from unknown causes.
A mother dead from disease.
A cold and distant brother.
A man obsessed with her.

Mitsuki's world spins wildly on the axis where all characters meet.

[From DLsite English]