If you loved I'm in Love With My Little Sister, try Haikara-san: Here Comes Miss Modern Part 2
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

I'm in Love With My Little Sister
→
Try this next

Haikara-san: Here Comes Miss Modern Part 2
What they share
Theyboth carry the bittersweet, tender mood tags, and they sit in Animation / Drama / Romance territory. If that's the register that drew you to I'm in Love With My Little Sister, the second film will land in a comparable space — through a different lens.
bittersweettender
What Haikara-san: Here Comes Miss Modern Part 2 is
The 1900s Japan where flounces collide with factory whistles. Benio Hanamura battles corsets in spirit while her beau, Shinobu Ijuin, returns sans soul. A betrothal clock ticks louder than any steam engine.