After fondly recalling his late grandmother, Nobita Nobi yearns to reunite with her and implores Doraemon to transport them back in time. Upon a heartwarming reunion, Nobita's grandmother expresses a desire to meet his future spouse. Driven by love and respect, Nobita agrees and hastily ventures into the time machine with Doraemon, journeying into the future. However, upon arriving on Nobita's wedding day, they are shocked to find the absence of the future version of Nobita at the nuptials! Committed to righting this mysterious occurrence, Doraemon and Nobita set out on a quest to locate Nobita's missing future self and guide him towards the happiness he is destined for.