My dad was once a promising ace in the martial arts world. But now he's just a training partner for newcomers, and my mother has grown tired of him and moved out, leaving me and my dad to live in a small apartment. Then, one day, that woman showed up. Confused by the woman flirting with my dad without caring who was watching, I locked myself in my room, not knowing where to look, but a few days later my dad disappeared without a word. And so began a strange life of cohabitation with my dad's woman, who suddenly decided to take care of me.