Ruri's plans to bring Onodera closer to Ichijou in last week's episode ended up backfiring somewhat thanks to that whole "trapped in a storeroom" incident involving Kirisaki - however, she isn't done with her attempts to play cupid by any stretch of the imagination.
For starters, she makes sure to talk loudly about Onodera's key, and how it pertains to a boy she was in love with a decade