The twins Yoko and Keiko, who lost their parents in the Sea of Japan offshore crash that claimed the lives of 138 passengers and crew. As time passed and they became adults, Yoko, despite the concerns of those around her, developed a deep relationship with the ill-behaved Akira Tashiro. However, Yoko did not tell Akira about her sister's existence. There was a scheme behind it, and a sad reason...
