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"A spider-monster that appears on Sado Island of the Niigata prefecture. It appears while making noises like a baby's cry. Dead or abandoned babies sometimes transform into an Ubu. They grab onto passerby and kill them. If one grasps your leg, take off a shoe, throw it over your shoulder and yell, "This is your mother," and it will disappear."
"A spider-monster that appears on Sado Island in the Niigata prefecture. It appears while making noises like a baby's cry. Dead or abandoned babies sometimes transform into an Ubu. They grab onto passersby and kill them. If one grasps your leg, take off a shoe, throw it over your shoulder and yell, "This is your mother," and it will disappear."
—Shin Megami Tensei IV Apocalypse compendium
Ubu appear in the west entrance passage, west entrance and government office plaza areas of Shinjuku. It can teach the Toxic Sting, Tetanus Cut, Stun Needle and Rapid Needle skills through its Demon Whisper. Ubu benefits from learning ailment and Gun skills.