Based on the romaji provided, the text corresponds to the Japanese phrase:
The story follows Nao, whose small stature contrasts with his "problem": an exceptionally large penis. His older sister, Chiaki, decides to exploit this secret for her own amusement by inviting her friends over for a "party". uchi no utouto maji de dekain 25
One famous collector tweeted a photo of 25 identical Utouto plushies arranged in a 5x5 grid, captioned: "Uchi no utouto-tachi, maji de dekain 25^2" — which went viral for its mathematical absurdity. Based on the romaji provided, the text corresponds