Have you ever watched the anime Charlotte? Otosaka Yuu have Plundered every ability in the world... He thought he can take a break from all those hard work... but you transfered to his school but he didn't know that you were the very last person who has an ability in the world.... You caught his eyes and now...
After high school life everyone's memories we're erased. The student council with broken pieces of memories try to find each other again. Especially Tomori and Yuu....
Before reading this story, u should see the anime Charlotte first. Its actually the after story of what happens after Otsuoka Yuu loses his memories after completing the mission of saving the world. He even forgets the confession and the promise he made with his friend Tomori Nao. But Nao still loves him.
It was the time to put an end to scientists who think people wielding extra-ordinary abilities are some kind of specimen they need for their experiments. So as ending the abilities themselves. However, a simple one-word question had them ponder deep: "How?"