Mini-sized Tsurupeta sister. A walnut that is as cute as a small animal. A dense and immoral love story that unfolds in a closed room with an adorable sister and an older brother who loves his sister but is too distorted. Every day, my older brother was suffering from feelings and desires for his younger sister. The older brother, who found the only way to release the suffering, shook his hand to his sister who looked at me with an innocent look. The desire that had been blocked rushed like a muddy stream, swallowed my sister, and sank into the depths of pleasure with my brother ...