Yeah, I don't think this needs to be marked. I only hold the specific chapter linked to the NSFW standards, not the series as a whole. So, there are often series where some chapters might get the NSFW tag and others don't. Flipping through just now, there isn't any NSFW in this chapter.
It was because it was marked as erotica but honestly it was mostly ch2 that showed nudity
so I'm not really sure on the nsfw stance anymore
Either way though, thanks for sharing as this series is pretty interesting, I especially enjoyed seeing the emotional maturity and individual complexity from the cast revolving around Fujii