In general, the above movie is very similar to Pretending to visit and secretly fuck the lover's sister, only playing the role of the "active person" a little, perhaps because of the same sex studio production or the same series, they are similar.
The entire more than 190 minutes of the film revolves around 4 lewd "sisters-in-law", seeing that her brother-in-law is younger than her husband, so she has a sexual temper, and in the evening when she waits for the whole family to sleep, she starts abc xyz.
Regardless of the order of the actors in each segment of the film, the female leads are: Ayaka Tomoda, Sakura Rio, Hitomi Fujiwara, AIKA, Nao Mizuki