Here is the information and feature overview for the title you requested:

Abstract

Joshiochi: 2-kai kara Onnanoko ga... Futtekita... (2021) is a short-form ecchi comedy manga and anime that presents an ostensibly absurd premise: a young man’s second-floor room repeatedly produces a hole through which high school girls fall onto his bed. This paper argues that the series uses its impossible spatial setup to explore three key themes: (1) the reduction of narrative logic to pure fan service delivery, (2) the parody of harem genre conventions through random entry and exit, and (3) the normalization of accidental intimacy as a comedic structure. By analyzing the show’s spatial economy, character archetypes, and episodic loops, we see how Joshiochi operates as both a critique and a celebration of ecchi’s formulaic nature.

The plot would inevitably pivot into the “Living Under the Same Roof” trope. Because Hiyori’s apartment ceiling (the floor Kaito is under) is now a gaping hole, they must share Kaito’s studio apartment while repairs are made. Repairs that will take the entire 13-episode season.

The story follows Sousuke Aikawa, a part-time worker living in a dilapidated apartment building. His life is fairly mundane until one day, the ceiling above him literally gives way. Sunao Unyuu, a girl living on the second floor, falls through the hole and lands directly on him in a highly improbable and suggestive "miracle" encounter.

Paper-Thin Narrative: If you’re looking for character growth or a deep story, this isn't it. The plot exists solely to move Sousuke from one erotic mishap to the next.

Finding a series that perfectly balances comedy, romance, and a bit of "risqué" charm is a tall order, but "Joshiochi! 2-kai kara Onnanoko ga... Futtekita" (Girls Falling from the 2nd Floor) manages to hit all those notes. Originally a popular web manga that transitioned into a buzzworthy "ComicFesta" anime, this series has carved out a niche for fans who enjoy the "accidental roommate" trope taken to a literal extreme.

This moves the series from pure titillation into metagenre commentary: Joshiochi acknowledges that viewers are not watching for story but for the creative execution of a single gag. By removing all pretense of plot, it becomes a minimalist study of the ecchi moment itself.