Kingyo (2009)

A university professor decides to go for a tour in Akihabara, guided by a young woman dressed up like a French maid. As they both walk through the streets of modern Tokyo, the man and the young woman gradually speak of a past they both share, and ultimately a painful love triangle that continues to haunt them. A poetic rumination in love, memories and loss told almost entirely with split screens.

Unfortunately the movie Kingyo is not yet available on HBO Max.