An older brother who dotes on his younger sister. The younger sister loved her older brother who doted on Ke'ai. When the older brother went to university, he moved to Tokyo and started living with the woman he loved. However, she grew tired of his excessive love for her and they broke up. He dropped out of university, and with no motivation to work, he became a recluse and his life fell apart. Around that time, the younger sister's grandmother passed away, so she moved to Tokyo to stay with her older brother. She was Kokoro to be able to meet her beloved older brother. When she got home, she found that he had changed drastically and there was no trace of the older brother she loved. And so her life of confinement with her despicable older brother began...