I wouldn't consider this a "Happy ever after" ending, but it is technically a more positive ending.
The story for both movies differ in terms of love interest and which parent MC choose to stay with after they get divorced.
Story -
MC stays with mother, a normal citizen. MC goes to public school, falls in love with a smart girl. They played with the idea that both the guy and girl has actually switched places with their other selves multiple times in the movie, but both don't realize. It had a good start, playing with the idea of "What if" and choices. Makes the viewer actually think about how different life be if they made different choices, maybe they be happier, maybe they be together with a girl instead of strangers if they just dared to start that conversation.
Voice Acting -
Horrendous. It be mean to say the movie is boring at times, but the actors surely are. MC is the most tone dead emotionless character i have ever seen in all anime. The other characters' performance aren't any better either, but damn MC voice acting really kills the mood since you will hear him the most. The voice acting is absolutely flat, no range of emotions. Its hard to feel happy or sad when your voice actors can't even portray that emotion.
Animation
Does not fee like a movie level budget, rather ordinary. Not to say that its bad, given the standard of the movie, breathtaking animation really is not needed at all.
Is it necessary to watch the second movie
Honestly no. Both movies at the end will give you a short summary of what goes on in the other universe for context. Of course, the other movie will go into way more detail on the perspective of the other side.
Conclusion
Overall, it is an average forgettable movie. I looked forward to this movie and i was left underwhelmed.
I consider this the better of the two movies.
