The core plot typically revolves around a protagonist—often a college student or a young man living alone—whose daily life is disrupted when a relative (usually a niece or cousin) comes to stay at his home for a period of time.
The particle is the most confusing part of the transcription. In standard Japanese: shinseki no ko o tomari da kara hentai
In Japanese adult media, the scenario is a popular sub-genre. It creates a narrative of forced proximity. The tension arises from the need to be quiet or secretive while engaging in acts in a home that is not one's own. shinseki no ko o tomari da kara hentai
To understand the meaning, we must deconstruct the sentence into its component parts: shinseki no ko o tomari da kara hentai