Yoru Kasai is an ordinary person living on Earth until the day the Dhakads, a group of powerful beings with unique abilities, attacked his hometown. Yoru discovered his ability to go back in time with his memory intact, and every time he died, he could go back to change events. He realized he was the only person who knew about the Dhakads, but nobody believed him. Yoru made it his mission to seek revenge against the Dhakads and kill them all, but he found it impossible to do alone