裕福だが仕事ばかりで家庭にあまり興味を持たない父、母は男を作って出て行ってしまった。そんな僕たち兄弟の面倒をみるために父が家政婦・椎名さんを雇ってくれて…。仕事ぶりは完璧だが、無表情で何を考えているか分からない彼女にどう接していいか分からずにいたのだが、ある日兄の部屋で行為に耽る姿を目撃してしまって…！？

My father was wealthy but always worked and had little interest in family, and my mother left after having an affair. To take care of my brother and me, my father hired a housekeeper, Ms. Shiina… She was perfect at her job, but she was expressionless and I couldn't tell what she was thinking, so I didn't know how to interact with her. But one day, I witnessed her engaging in sexual activity in my brother's room…!?