Komine is an ordinary grade-school kid who is at the top of his class. And for good reason—after dying, this is actually his second run at life. Knowing everything from upcoming class subjects to future events, Komine naturally excels at whatever he does... and then there's Sarara Miyano, Komine's classmate. The last time he was in school, he was despised by her because of some foolish actions he took in the past. But now that he's mentally older and wiser, maybe he can turn things around?

(Source: MangaDex)