At 66%-ish (I am on my iPad) Yoriko is spelled as Noriko, it's the scene when Aiko is on Yuichi's bed.
The sentence reads, "Aiko looked at Noriko with eyes glowing red."
I have now decided I need 2 very important things from this book:
for Orihara to be happy, I don't care what has to happen but I want one of the books in the series to be all about her and her happiness.
I want Ibaraki to be in danger and Yuichi finally accepts he is a good guy and goes to save him (Since this is a Harem book I highly doubt the author taking this in a BL direction...and for all I know the Fujoshi like Ibaraki X Yuichi the way they are now...yes I am making Yuichi the Uke)
Also that illustration of Aiko and Yoriko on the bed, PRICELESS!