"Gaiden" is an artifact costume in the StrikeForce Kitty series, based on Ryu wearing the Traditional Dark Blue or the Legendary Ninja outfit.
"Gaiden" (外伝) means "side-story" in Japanese, and references the name of the video game series, Ninja Gaiden (忍者外伝).
StrikeForce Kitty 2
"artifact 10" can be equipped to a kitten that wears the "Shadow" cosplay set. Like its predecessor, "Gaiden" does 
melee damage and has the same passive set ability, a 7% chance to deal double the damage to an opponent.
"Gaiden" adds 20 strength, 13 health, and 21 speed to that kitten, for a total of 31 strength, 22 health, and 31 speed, from "Shadow".
StrikeForce Kitty: Last Stand
Legendary Ryu in Last Stand
"Shadow" is a cosplay that can be obtained from defeated raccoons in StrikeForce Kitty: Last Stand, look on pages in the "Melee" category.
See also
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