Twilight Narcissus 2 (1991)

Painter Haruhiko returned from Paris for the first time in a while to hold his solo exhibition. There, he sees Shinji, who looks exactly like Shingo, his old lover who passed away. Shinji turns out to be Shingo's younger brother. Shinji secretly read his brother's diary and learned about Haruhiko's relationship with his brother. Haruhiko becomes conscious of Shinji while immersing himself in the memories of those days, but Shinji has a girlfriend, Azusa. Shinji wants to know more about his older brother when he was alive, so he promises to meet Haruhiko again at a later date, and they part ways. The sequel to "Twilight Narcy."