Mysterious monsters called "UMA" suddenly appear in the present day and attack humans. The scientist Sōsuke Banba pursues the truth with the keyword "Kagewani," a word that literally means "Shadow Crocodile."

The series is directed by Tomoya Takashima and written by Hiromu Kumamoto, with animation by animation studio Tomovies. Character designs for the series are provided by Ami Fujikawa and Ryōma Hori, and the monster designs are provided Shunsaku Matsurida. Tsutomu Nagae and Kentarō Iwakiri are producing the series. The series' theme song is "Arrival of Fear" by M.S.S Project.