Synopsis: 17-Sai Kara Yarinaosu Propose

*“I wish I had liked you when I was a high school student …”* Osamu’s girlfriend refused his proposal with these mysterious words. After that, in an accident, he time-leaps back to his high school days. He was trying to find her and make her fall in love with him again, but when he met her she had a twin sister…! ??