角乃が探し続けた最愛の妹・一河緒乙が カリスマギャル・おとぷん様になって帰ってきた！？ さらに緒乙は、指輪を持つユニバース戦士に。 その名も、天下のギャル姫シンケンレッド！ 一方、街にもギャルノーワンが出現！ ギャルバトルに立ち向かうため、 緒乙による、ゴジュウジャーのギャル修行が始まった！ しかし角乃は、記憶を無くし、豹変した妹の姿に戸惑いを隠せない様子で… 緒乙に一体何があったのか、 その謎の答えはシンケン指輪にあり！？
Kadono's beloved sister, Ichikawa Ototsu, whom she has been searching for, has returned as the charismatic gal Otopun-sama!? Furthermore, Ototsu has become a Universe Warrior with a ring. Her name is Shinken Red, the world's greatest gal princess! Meanwhile, Gal No One has appeared in the city! In order to face the gal battles, Ototsu has begun the Gojuger's gal training! However, Kadono can't hide her confusion at the sudden change in her sister's appearance, who has lost her memory... What on earth happened to Ototsu? The answer to this mystery lies in the Shinken ring!?
