In his previous life, a young man discovers that he and his twin brother were part of an experiment in which their parents deliberately raised them under contrasting conditions. He was mistreated until the very end of his life. Reborn in his final year of high school, he faces his parents' demand that he drop out and work in a factory to support his younger brother. He firmly refuses. With his teacher's help, he applies for financial aid and arranges to live at school, protecting his chance to continue his education. Determined to achieve outstanding results in the college entrance examination, he resolves to reclaim the life that should have been his.