Because the original joke is . In 2024 or 2025, new anime fans watching Osamake for the first time won't hear the mishearing as clearly, because streaming audio codecs have improved, or because they are reading subtitles that correct the grammar.
The keyword refers to the adult anime (hentai) series titled Uchi no Otouto Maji de Dekain Dakedo Mi ni Konai? , which premiered its first episode on April 28, 2021 . Produced by the animation studio T-Rex , the title translates roughly to "My Little Brother is Seriously Huge, Want to Come See?" and stands out as a quintessential example of the "shota" and "size difference" tropes prevalent in adult Japanese animation. 🔍 Series Overview no otouto maji de dekain dakedo 2021