To the dismay of Walter as well as Yumiko and Yumie, Yomiko earned the title of “biggest fan” back in the first Read Or Die tankōbon.

Nenene: {I did say fangirls are all the same.}

Yumiko: {Thank you, Sumiregawa-sama — this means so much to me!}

{Make it out to ‘Your biggest fan, Yu–‘}

Nenene: {Sorry, I can’t do that.}

Yumiko: {Why not?}

Nenene: {Because my biggest fan is that woman there.}