Alvaro Jameson spends a day off from high school to visit his local natural history museum. During his tour, he discovers that a fossilized dinosaur egg has gone missing. He fears that a magic user is stealing artifacts, so he calls in his high school's Witch Mariko Takashi, his partner in solving supernatural crimes. When the museum gets locked down, Alvaro and Mariko uncover a plot that a reanimation Witch is bringing back to life prehistoric creatures. Will the two survive an onslaught of dangerous monsters and save their city?