The term "hot" in this context often refers to the of the trailer rather than just its content. Several factors contributed to this surge:
Ibuki stumbles into a severe backstage scandal involving Koharu and their representation.
The trailer depicts the idols being manipulated and forced into a cycle of "moral corruption" and "forced pleasure" as they fall into the producer's trap. The Movie Database (TMDB) Series Details Total Episodes: Voice Cast: Koharu Shirasaki: Saya Kaduki. Arisa Kurozuka: Aisle Kurose. Ibuki Asaba: Yuu Hazumi. Adult Anime (OVA).
Because Kegareboshi is an explicitly mature content piece (18+), the promotional materials and episodes are not typically hosted on mainstream, all-ages streaming networks. Instead, they are distributed via dedicated mature anime retailers, official production site portals, and specialized video communities.
What is the ? (YouTube description, a blog post, or a social media caption?)
Data Sheet