From the publisher:

Stormbreaker Peach Momoko takes her version of the Marvel Universe to the next level! Welcome to another dimension — one filled with wondrous creatures: sentient samurai armor, a winged individual in a falcon mask, a mysterious panther person and a red, snakelike monster with a deadly appetite. As these incredible Yokai battle, will Mariko Yashida be forced to choose a side? When Iron Samurai clashes with Shield of Justice, their war will be anything but civil — and their cataclysmic confrontation could devastate two worlds! Meanwhile, the spirit world is divided — and Mariko finds herself caught between Phoenix and Magik! And another Yokai with incredible power has plans to paint the world scarlet! Collecting DEMON WARS: THE IRON SAMURAI, DEMON WARS: SHIELD OF JUSTICE, DEMON WARS: DOWN IN FLAMES and DEMON WARS: SCARLET SIN.