The Demon
鬼畜 (original)
When Sokichi's abandoned mistress shows up on his doorstep with their three children, she is as surprised to discover he has a wife as his wife is to discover that he has a mistress.
Starring Shima Iwashita, Ken Ogata, Mayumi Ogawa, Hiroki Iwase, Miyuki Yoshizawa, Jun Ishii, Jun Hamamura, Keizo Kanie, Yoshi Katō, Mizuho Suzuki
It's a drama movie, and has a rating of 7.4 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Austria.