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In 2021, the third episode of the OVA (Original Video Animation) series was a major focus for fans. Episode 3 Release:

However, there is with that exact title. The phrase is a genre descriptor:

The harem structure, by volume ten, has long abandoned realism for systemic convenience. Each heroine exists as a node in a relationship network that cannot progress to exclusivity without breaking the premise. Thus, volume ten typically introduces the "forced proximity" trope: the protagonist and one heroine become trapped in a cave, magically bound together, or forced to share a bed due to inn shortages. These scenes do not advance romantic resolution but instead offer calibrated fanservice—emotional and physical—designed to reassure the reader that the protagonist remains desirable and the heroines remain available. In 2021, as the light novel market became increasingly saturated, such volumes faced the challenge of avoiding "harem fatigue," where the reader grows bored of unfulfilled romantic tension. Successful volume tens introduce a new, temporary rival heroine or a returning antagonist to disrupt the comfortable hierarchy, only to restore it by the final chapter.

The phrase most likely refers to the release of the 10th chapter of the adult manga/anime series Isekai Harem Monogatari , which occurred in 2021 . Series Overview Title: Isekai Harem Monogatari (Harem in Another World)

Isekai Harem Monogatari Episode 4: Release Date, Story, and What to Expect from the October 2021 Update