Koko, and I wouldn't mind...
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Artist's commentary
"Good Day! Myouren Temple EX" EX-45: Underground City and Youkai 14
.:*゚..:。:.Balls.。*゚+.*.。Balloon+..。*゚+Ballroom.:*゚:.。:.
Kintama (testicles) => kirakira (sparkling) => kin'youbi (Friday)