I don't know why they're so unpopular, I mean, look at Shizuha, she is so cute, and looks like Rumia, just that Rumia is cuter.
Errrr....

They're popular by being unpopular.
Wait, what the u're...

Rapattu draws a great Shizuha and a great Minoriko.

I think it might be because of Minoriko's hate. I'm pretty sure Shizuha is more popular then her.

I think because of her hat, I myself don't like that hat in the official art. But Rappattu did do a great job here, I love everyone in his comics.