If you loved Time Traveller: The Girl Who Leapt Through Time, try Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals
A bridge between a film you've already seen and one most people haven't. Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals has roughly 4.8× fewer votes than Time Traveller: The Girl Who Leapt Through Time — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Time Traveller: The Girl Who Leapt Through Time

Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals
What they share
Theysit in Adventure / Science Fiction territory. If that's the register that drew you to Time Traveller: The Girl Who Leapt Through Time, the second film will land in a comparable space — through a different lens.
What Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals is
You investigate strange ruins overseas. A lost set of medals calls to you. But the unearthing rips a hole in space-time. Japan now warps. A sorceress rises, eager to become king. Shibasaki presents this tokusatsu entry like a stage play, complete with scene wipes and an ensemble that makes you wonder what Kamen Rider might gain by going full JRPG.