Really cute, wholesome and I like it.
Of course, the definition for a "real idol" is about to get a kick in the teeth I think, which may cause this story to become funny in retrospect. Because now in my world at least "real idols" are girls who do things like shouting "I'm horny!", sniffing her own feet, or even openly pondering how she'd lewd Kanna Kamui.
(basically Yagoo would look at anyone doubting Yoko's potential as an idol and go "lol your dream is weak mine is forged in dragon fire")