The Chugoku region's hero, the Mouri clan, has finally begun to travel to Kyoto. There is no future for the alliance unless Motonari Mouri, who is fiercely hostile to Kuon, is defeated. Mouri overwhelms even Shino and Shizuku with Motonari's ingenuity, which seems to read the future, in addition to the mighty navy. The cooperation of the three sisters, Takamoto Mouri, Motoharu Yoshikawa and Takakage Kobayakawa, boasts strength that surpasses Ayana and Koyuki. The swordsmen and the others are forced into an unprecedented tough battle against a formidable enemy that stands in their way like a giant wave. Set in a raging sea, the greatest naval battle of "Sengoku Koihime" begins! Beyond the ever-overheating Sengoku turbulent times!