我妻さんは俺のヨメ

Hitoshi Aoshima is an unremarkable high schooler pining after Ai Wagatsuma, the smart and beautiful girl out of his league. One day he slips ten years into the future and finds himself married to her, then snaps back to the present. Armed with glimpses of that future, Hitoshi tries to court Ai, only to learn that small choices now can rewrite the timeline, including versions where the marriage never happens.