Shinonome Neo is 28 years old and single. During his school life, he was disturbed by his senpai, Maki Yuuki. That is how, ten years later, he can't trust in other people or even have a girlfriend; when he receives an invitation to Maki's wedding, he decides to take revenge and spoil it… But destiny is cruel with Neo and he dies… After this, his spirit travels back in time and gives him the oportunity to change everything by avoiding the ruin of his entire life and his death. With the help of the 15-year-old Neo, he is going to change the future.