Makai Toshi Shinjuku, Ninja Ryuukenden Recommendations
Two anime about a guy wielding an outdated weapon to fight inhuman creatures and protect humanity from some mysterious threat. Each shows progress (or digression, if you will) into a rescue-the-girl type of story, with a traditional final battle that should both decide the fate of all of us, and save the love interest of the protagonist.
Also, for all Kawajiri fans, Ninja Gaiden should be on your list, it is pretty similar to what Kawajiri used to make.
In both the protagonist will try to prevent his enemy from breaking a seal.
Em ambos o protagonista irá tentar evitar que seu inimigo quebre um selo.