I’m honestly confused? Does kurumi know ruriko is in love with her or just think she loves her? And the same to ruriko? Wait does kurumi know she’s maybe in love with ruriko?
i think based on recent chapters, kurumi was initially pretty dense and thought of ruriko's "like" as a platonic like... I'm guessing she unconsciously kept that thought pattern up until they met Rio in ch19 and kurumi became a bit jealous of rio's familiarity with ruriko. at that point, we see kurumi starting to feel like the hugs she gave ruriko to be a little different in a healing way.
i think kurumi has always known deep in the back of her mind, but she's purposefully avoiding "love" because she feels like she doesn't have time for it, or that someone won't love her the way she is. rio straight up tells her that "you're ruriko's one true love!" and says that they make a great couple. with that, I would say that kurumi definitely knows but is just dancing around it, up until our most recent chapters where she is starting to accept the changes in her feelings for ruriko (ie: finding ruriko cute and different from other friends, etc).
ruriko isn't shy about her feelings either haha.