This Sister Is A Ferocious One, Lara Kudo.
She used to be a cute little sister, but she was inspired by a Yankee comic book and became a ferocious little sister who wielded a nail bat. The otaku brother could not resist her and was always being raped by her. One day, the otaku brother decides to take revenge on his sister after she destroys the figure he cherishes more than life itself with a nail bat. He decides to take revenge. He restrains his sister while she is napping, and his revenge begins as he explodes his anger and frustration! The otaku brother punches the sister in the stomach continuously...
