I should check if there's an existing documentary with a similar title. Let me search... Hmm, not finding exact matches. Maybe the title is specific to a local production, perhaps in Japanese. Since the user specified 2021, maybe it's related to the anniversary of the 2011 Tohoku earthquake. The Port of Tomari is in Shikoku, so perhaps the documentary focuses on the aftermath in that area.
The base term originated as the title of an independent Japanese 3D short or doujin web animation produced by circles like Awakotoya (あわこと屋). These short-form clips usually revolve around domestic, slice-of-life, or mature situational tropes common in independent Japanese animation circles. shinseki no ko to o tomari dakara de na tum 2021
Based on the phrase provided, you are likely referring to the Japanese adult anime (H-anime) series titled Shinseki no Ko to Otomari (親戚の子とお泊まり), which was released in I should check if there's an existing documentary