This is not a known idiom, marketing phrase, proverb, or popular culture title. It reads as ungrammatical or incomplete Japanese. You may have misheard or mistyped a quote from an anime, a game, a novel, or a social media post.
Because of its explicit nature, the series is not available on standard platforms like Crunchyroll or Netflix. Viewers typically find it through: shinseki no koto otomari dakara
The girls in the series exhibit distinct personalities, ranging from Narumi's carefree and flirtatious nature to Sei's quiet and enigmatic demeanor. Asahina's energetic and optimistic personality serves as a contrast to the more subdued characters. This is not a known idiom, marketing phrase,