Amnesia

Amnesia is a Japanese anime television series based on the visual novel of the same name by Idea Factory. The anime series aired in Japan between January and March 2013, and was simulcast by Crunchyroll. A second season, titled Amnesia Later, aired between July and September 2013.

A young man named Kentarou awakens in an empty room with no memories of who he is. He soon discovers that he has the ability to travel back in time, but only for a few minutes at a time. Kentarou soon learns that he is able to use his power to help people, and he sets out to use it to make the world a better place. However, he soon discovers that there are others with similar abilities, and that not all of them have good intentions. Kentarou must use his power to stop them before they can cause any more harm.