Oh, come on. It's the story of what happens when the absolute power deriving from unprecedented future steps in human evolution are granted to a pissed off teenage boy. Then he becomes a new universe. What?
In all seriousness, they took like 20 400 page manga volumes and tried to cram the story into a 2 1/2 hour movie runtime. That's like condensing all three unabridged volumes of The Gulag Archipelago into a 45 minute TV pilot.
My Urusei Yatsura the Movie 2: Beautiful Dreamer Laserdisc succumbed to laser rot, but it's more of the picture-dissolving-into-static kind of laser rot. Maybe it's because it was just a CLV Laserdisc (1 hour per side but no freeze-frame on standard players), this one looks like a CAV Laserdisc (1/2 an hour per side with full freeze-frame), CAV laser rot is probably more spectacular.
I haven't actually tried playing any of my other Laserdiscs in years, probably some/most/all of them have some degree of rot by now.