I've just read to the end of the series today. The whole series is very cute and wholesome, but it does not focus on romance or even have explicit romance at all, it's all about friendship (including how friendship functions with the intense feelings for one's idol in the mix) until the end. However there are good shipping material for MC Sakiko and the "yandere" Maaya all around, especially vol 04 and 05, and they end up living together when they are adults, and they hold strong friendship with Chihiro who continues working as an idol and visits the two all the times. One time Maaya confides with Sakiko that she does have [romantic] feelings for Chihiro, but never told Chihiro "because she might not know what to do with it" and keeping the current friendship is more important. Sakiko and Maaya bond together with that sort of feelings for their idol. So I guess it's more Subtext
than outright Yuri
.