: It is primarily known as an OVA (Original Video Animation) or a short anime series. Terminology Breakdown
Thus, a straightforward reading of the phrase would be: "Therefore, it's autumn, because of the sleepover." However, "Otomari Dakara Aki" on its own has no universally recognized idiomatic meaning; it appears to be a fragment or a creative construction. The first part, is the most ambiguous. A likely scenario is that it represents a slight misspelling or alternative romanization of "Oshi no Ko" (推しの子) —the blockbuster anime and manga series about the dark side of the entertainment industry. Given that "Oshi no Ko" remains a massive cultural phenomenon in Japan and abroad, the similarity in sound makes this a compelling connection. Additionally, the voice actor Takaki Otomari , who shares a surname identical to the keyword’s "Otomari," has a confirmed role in "Oshi no Ko," where he voiced the character Hooded Man . This interweaving of "Otomari" with the "Oshi no Ko" universe is likely more than a coincidence and firmly grounds the phrase within a specific anime context. shinseki no ko to otomari dakara aki verified