Sakaki Hina. Not only her face but also her big breasts and style is perfect. She is short and small, but also cute and charming. Her personality is bright, innocent and healthy. She was a cute “younger sister” who went to the same private school as Momo.

One day, my younger sister confesses to me. She loved me as the opposite sex. It was the same for me… We became “lovers” that day.

But me and Hina are just “brother” and "sister" in the school. I can't profess that me and Hina have become lovers. Moreover, my sister is a popular person in the school. There are guys around me who are seriously aiming at my sister. Self-proclaimed best friend Yajima Kei. Dr. Masakazu Nitani, an advisor to the art department and the school chief over Hina. And Shinonome Yuuya, famous for his bad cards.

They reach out to my younger sister.
Such guys can't take my loved Hina from me.

Will I be able to protect my sister from them ...?

[Translated and edited from Mink Ego's product page]