The ghastly image of a goggle-eyed creature that triggered the so-called Momo Challenge — a viral social-media hoax terrifying children and parents alike — was born in a cluttered two-story studio on the outskirts of Tokyo.

The creator of the girl-like monster, Keisuke Aiso, seemed baffled by his newfound fame brought by the disturbing phenomenon amplified by unverified reports of children being enticed by the fictitious Momo into performing dangerous tasks involving self-harm, and even suicide.

"I have a small child myself so I can understand how parents are concerned," the 43-year-old special-effects artist said.