The Saint Warrior girls continue their desperate march in the otherworldly castle of the evil-hearted Eris to deliver a golden hairpin to Athena Saori. Standing in front of Dolphin Mii is none other than her past love! What action will Mii take when faced with this decision!? Meanwhile, the golden Saint Warrior Milo of Scorpio, having defeated Rigel, sacrifices himself to break Eris's barrier and make his way into the otherworldly castle, taking surprising actions!