Basilisk: Ouka Ninpouchou

Synopsis

In the alternate world, Hachiro and Hibiki easily defeat the Joujinshuu because they already know their techniques, leaving only Joujin standing. They use their Ouka to defeat Joujin, and Hachiro kills him. Hachiro plans to leave Hibiki, but she cuts her eyes, so he will stay with her. However, Joujin is not dead, surviving because of the power of Tenzen within him. Joujin cuts Hachiro, but Hachiro manages to use his Ouka to awaken Tenzen's hatred for Hachiro to force Joujin to kill himself before Hachiro dies. Some time later, the blind Hibiki is present at the early days of training of the young Iga ninja. Joujin re-appears, resurrected again by Tenzen, and he proposes to rape Hibiki so that their bloodlines will merge and continue. However the spirit of Hachiro within Hibiki emerges and cuts Joujin to pieces, finally killing both Joujin and Tenzen.

(Source: Wikipedia)