If you loved Beyond the Boundary: I'll Be Here – Past, try Overlord: The Undead King
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Beyond the Boundary: I'll Be Here – Past
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Overlord: The Undead King
What they share
Theysit in Action / Animation / Fantasy territory. If that's the register that drew you to Beyond the Boundary: I'll Be Here – Past, the second film will land in a comparable space — through a different lens.
What Overlord: The Undead King is
You wake to find yourself undead in a world that won’t log out. The NPCs ache with feelings you never coded. Now a skeletal sorcerer, you rule allied creatures by sheer will. The simulation fraying, you hunt the truth behind the shutdown. The game keeps changing, monsters kneel, people scream.