I don't even watch Idolmaster, but I still really really enjoy Yuika's doujins for this series. You don't really need to know the series to appreciate this adorable fluff, I don't think.
... Did Rina catch the "hewwo" meme disease that circulated a couple months ago? And what's up with the adding "poyo" to words (wassupoyo, poyoword, etc.)? I know she has a bubbly personality but didn't think she has a dialect/elocution problem...