Let me think. "Yaboyroshi" could be a phonetic approximation of a Japanese phrase. Let's try to parse it. "Ya" might be よ, "boy" is ボーイ, and "roshi" could be ロシ, which sounds like Russia (ロシア). So putting it together: よボーイロシ? That doesn't seem to make sense in Japanese. Alternatively, maybe it's "Garo Yaboyroshi" (ガロ・ヤボーロシ), a character from the Garo series? Not sure. Wait, "The Promised Neverland" is "Yūjō no Neverland" in Japanese. Maybe the user is referring to an English-language academic paper combining these two.