Zero Kyori by Takagi Ryou

Summary

Plot: Shinonome Neo, 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 the invitation to the wedding of Maki, 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, avoid the ruin of his entire life and his death, so with the help of 15 years-old Neo, he is going to change the future.