Peach Momoko has made a name for herself as a cover artist, but Marvel’s Demon Days offered this “Stormbreaker” the opportunity to show her storytelling abilities. No one can fault her ambition. Demon Days is an attempt to reimagine the Marvel Universe through the lens of Japanese mythology and folklore, casting many of its extraordinary beings as yokai, spirits with supernatural powers that come in a wide variety of shapes and sizes. For all the ambition of the pitch, the Demon Days story—thus far consisting of one prologue set in the distant past and the four-part “The Yashida Saga”—has been a beautifully rendered but narratively straightforward affair, taking on the style of a fairytale crossing over into reality. “The Yashida Saga” ends true to form, with gorgeous artwork and a fable-like tone, but an ambition to expand the Demon Days universe further keeps the ending from being entirely satisfying.