Pixiv exploded just because the new girl has huge tits

... can you blame them?

the cowgirl outfit doesn't help matters either.

The new idols were lacking her assets.

Azusa, run for your money.

Ok, so far Cinderella Girls has introduced:
the youngest idol, Nina Ichihara,
the tallest, Kirari Moroboshi,
and now the bustiest, oikawa shizuku.
What's next, an Idol who beats Chihiya at being the flattest?

There is no way someone can beat Chihaya's bust size.

Wilfriback said:
There is no way someone can beat Chihaya's bust size.

You'd need either Akiha (Tsukihime) or Suika (Touhou) to do so...and even then it's not a sure thing.

BassGS said:
the cowgirl outfit doesn't help matters either.

From a different perspective, one could say that it helped matters greatly.