A slight change of pace in that both characters here are adults, a single man and a married woman who live next door to one another in a small apartment building. Adultery ensues, and while the mood is less gloomy than in previous chapters, the sex is again presented as casual and without moral consequence. Also much hotter here than in previous chapters. The image on page 24 of the FMC luxuriating in the sticky afterglow is especially memorable.
I should mention that the art throughout all these stories is quite good, though not particularly distinctive, and that magaka Arai Kei is excels at evoking authentic, three-dimensional characters in just a few pages of non-sexual dialogue. Everything rings true, which is rare in this sort of R18 work.