"I fell in love with my son as a man." Natsu, a mother, goes to take care of her only son once a month after he moves to Tokyo to attend university. It's only when they're apart that she understands her feelings for her son. It didn't take long for the abnormal love between parent and child that she had held for many years to turn into heterosexual love. There's no way something like this can be allowed. They have to go back to being normal parent and child as soon as possible... but what can she do now...? After much deliberation, Natsu decides to move to Tokyo again...