The Iga and Kouga ninja clans have been at peace for 10 years, following the end of their war. However, Gennosuke Kouga's defeat at the hands of Oboro Iga has led to conflicting accounts of the final battle. This has resulted in Tadanaga Tokugawa, who was allied with the Kouga, expressing discontent with the outcome. As tensions between the two clans rise, the delicate balance of power threatens to rekindle old conflicts.