As its title suggests, this is a sequel to Stand by Me Doraemon (2014). Following the events of that movie, Nobita and Doraemon travel to the future to witness Nobita's wedding, only to find that something has gone drastically wrong. There are a couple of reasons I found this movie to be more palatable than its prequel. For one, it no longer focuses on the "how Nobita and Shizuka got together" narrative, and as a result the unsavory aspects of how Shizuka is handled by the story are de-emphasized. Indeed, adult Nobita even raises a concern in this film that might well be on the minds of many Doraemon fans: the fact that Shizuka's decision to marry him can come across as having been made entirely out of pity. For another, whereas Stand by Me Doraemon tried to cram seven individual stories from the manga into a single movie, Stand by Me Doraemon 2 primarily adapts material from only two manga stories, with much more original content in between.
That's not to say that all of this original content is well executed. What is meant to be the emotional climax of the movie essentially involves Nobita's friends undoing a supposedly irreversible situation by emoting very hard. Additionally, for those who can't stand secondhand embarrassment, the sequence where young Nobita takes his adult self's place at the wedding (after aging himself up with the Time Cloth) might be hard to watch, though that at least is presumably the intended audience reaction.
Otherwise, however, I found overall story here fairly solid, with Nobita's grandmother getting to attend the wedding ceremony (something she's expressed interest in ever since the original manga, but never explicitly realized in the franchise until now) and adult Nobita's wedding speech at the end being particular highlights. I do have one final objection to make though: in his speech, Nobita credits his parents and grandmother for raising him, and yet does not acknowledge Doraemon even in passing. Come on now.
