ある日、弟が覗き見たのは不良たちに昏睡○○○される大好きだった姉の姿だった。 The Motion Anime

It seems that the older sister, who was a popular beauty in the neighborhood, had been eyeing a bad group for a long time. One day after school, her younger brother was summoned to the back of her school building. Fearing that he would be the target of bullying, his younger brother mixed medicine into his coffee after dinner the night his parents were away...