Since her husband's death, Yuka has been living with her son Yuugo. She worked tirelessly to raise him alone, and he grew up healthy, aiming for a top university. She thought that from here on out, their hardships would be rewarded, and once Yuugo entered society, a happy life awaited them...or so she thought. During the summer before Yuugo's graduation, Yuka and her son met with his homeroom teacher, Oshima, for a career consultation. After a promising three-way meeting, Yuka was left alone in the classroom and told, 'There is an issue regarding Yuugo's advancement...'
