The main actors are:
Yumi Shiroyama (Nishino Sho) married and living together with the Father in law.
Renjo (Ozawa Tohru). The father-in-law is an old lecherous creep with a talent for scheming and plotting. Dude is hilarious.
Motoo Shiroyama. The husband who cannot perform in bed.
Seiki. Yumi’s brother who got a thing for sisters.
Shimoji. An old military pal of Renjo.
Ozawa Tohru has done the father-in-law role countless times, but this got to be one of the best easily. And Sho Nishino, hot damn. She makes herself super attractive in this release. Especially when she starts wearing those slutty dresses. The little details, man.
Story: The story is pretty simple actually but the way it unfolds and the little details make it good.
Sex scenes: Subjective. I think Sho did a really great job.
Production values: One of the best I saw in a long while. MOODYZ and S1 tier. The camera angles, lighting, and presentation are superb. The story and pace are incredibly solid too. The zoom-ups are really awesome too.