The older sister who seemed nice at work turns into a violent and aggressive person at home. She vents her stress on her younger brother, but he has a secret.

He has discovered his sister’s private erotic SNS account. “This is…it’s you, right, sister?” The secret that was supposed to remain hidden has now been exposed to the very person it was meant to be concealed from. The younger brother’s counterattack begins.

You can read the original title here: Aneki no Ero Aka Mitsuketara