Kazuko (Tomoyo Harada, later narrator of the 1997 version) has known flower-obsessed Kazuo (Ryôichi Takayanagi of a couple other Obayashi films) since childhood. They’ve always been close, and once drank each other’s blood after a broken mirror incident. So she confides in him after passing out in a science lab and waking up with the barely-controlled ability to jump back in time, saving people from tragedies she’s seen occur from falling roofs and zooming bikes.
But it turns out these two met just recently, and Kazuo is a time traveler from the year 2660, collecting plants from the past for scientific research since the future world is barren, and he has psychically manipulated people into believing they’re friends with him, stealing Kazuko’s memories of her childhood friend Goro (Toshinori Omi, star of gender-swap comedy I Are You, You Am Me). The movie plays all this straight, just 1980’s teen drama to the point that even 1980’s-teen-drama-loving Katy, who loves the animated version, got bored and wandered off, but there’s some fun crazy stop-motion towards the end as she hurtles through time.