The keyword strongly resembles titles associated with adult-oriented animation (sometimes referred to as "hentai") or a very niche, possibly fan-made or misremembered title. The term "Papakatsu" (パパ活) is a Japanese colloquialism for "sugar daddy dating" (literally "daddy activity"), while "Nariyuki" implies "by chance" or "natural course." Combining these with "Girls -- The Animation - 01" suggests a first-episode adult OVA.