I Don't Want Nightmares-zansu!

Iyami, having accidentally awoken the spirit of vengeful samurai Chibita Juurozaemon Mitsutomo in a formerly-peaceful good night's dream, must play by "Elm Street" rules if he wants to survive: don't fall asleep. Unfortunately for him, the restless warrior has fallen for Totoko, with her seemingly under his ghostly power.