■ Story

I was being bullied by delinquents.
Even so, he continues to go to school every day because he can commute to and from school with his beloved sister Yumi.
I had fallen in love with her, who had been longing for her sister since she was little.
He must not be bullied by her.
However, Yumi finally found out about him –
“Don’t worry… I’ll protect Hiro-kun.”
Sister Yumi, who was attacked by delinquents to protect her, was forced to become her delinquent girlfriend.
She is gradually dyed by delinquents, and her body and mind fall.

■Appearing characters

● Yumika Hirosue (CV: Mitsuha Nono)
A childhood friend of the main character, Hiromu.
She loves Hiromu like her little brother and is called “Yumi-nee”.
She has a gentle personality and is caring.
She has a strong core, but she also has a side that is easy to be swept away.
Due to a certain incident, she became a plaything for the delinquents, and gradually she was swallowed by pleasure, and her behavior deteriorated.