In order to help her younger brother who is being bullied, her older sister Kokoharu dresses up as a man and infiltrates her younger brother's school. She grasps the weakness of the main culprit of bullying and succeeds in stopping the bullying, but on the contrary, she finds out her biggest weakness. It turned out that it was a woman. Her resistance is futile and she falls into pleasure... A beautiful girl who has become a male meat urinal. To the painful and sad ending where everyone covers their eyes...
