There's nothing new. This series, while slightly changing the title and setting each time, follows a standard pattern where a nurse (or similar role) actress is attacked by zombies. However, to be precise, they aren't zombies but patients with "ejaculation addiction," yet their acting is exactly like zombies. With a template-like development, the male actors are the usual faces, and the actresses have appeared in similar works before, so there's almost no difference each time, giving the impression that they're just going through the motions.
That said, this particular work has improved angles and camera work, which is commendable. Also, regarding the actress's sexiness, you might feel it more here. However, the development lacks any ingenuity, and as usual, it's long and gets boring midway. It starts off with a "cumming, cumming" feel, so if there had been a pleasure-fall at the end, it would have added some contrast, but in the end, it finishes with the same tension throughout.
The shooting angles were indeed good, so that's the only point worth watching for.
I want to see more of Riho's deep throat! I always look forward to watching your new releases. In this latest work, the expression during the deep throat irrumatio scene, where she's thoroughly tormented all the way to the back of her throat, was truly outstanding and incredibly arousing. That expression, blending pain and pleasure, is absolutely exquisite. Personally, I felt that if the irrumatio scenes had been a bit longer or more numerous, my satisfaction would have been even greater.