Sumomo Momoi is the second giantess to appea.  Sumomo was enraptured by a young man named Hide in her youth, who was a wannabe comedian who tried to get everyone to laugh. Tragedy struck when he was the victim of a car crash and died.

Sumomo and her brother mourned his loss, and Sumomo herself decided to take what she inferred was his ideals and always take things with a hearty laugh. Later on, she was found and bonded with a Chaos, allowing her to become a giantess standing 70 meters.