Anger (2016)

Both movies make certain characters out to look like they could be killers, and we are left guessing if they really are until the very end.

Akunin and Ikari have a sort of slow and sprawling dark narrative that feels quite similar. Both with an emphasis on human nature and paying close attention to the cinematography and music. If you like the one, you'll probably like the other.

Tsumabuki Satoshi is in both of these as well.

Both star Tsumabuki Satoshi
Both are crime/mystery genres

Both movies star Ayano Go as a homosexual character with a sad ending.

the underlying theme in both is suspicion and the inability to (fully) trust those around us. Anger shows the tragic outcomes that can result from that, while Maggie has a more quirky approach and a fantasy element to it.