One of the most confusing parts of life is knowing where you are in a relationship. It's difficult enough with someone new, but when it's someone you've known for a long time and your own feelings have changed, it's even worse. That's where Tsumiki is with Io. They've been friends for a while, even though his laid-back nature seems the opposite of Tsumiki's short fuse, and they both hang with the same group of friends. But while Mayoi, Sakaki, and Hime are all great friends, Tsumiki's relationship with Io seems a little bit more. Are they a couple? Best friends? Tsumiki can't figure it out, and asking Io directly could jeopardize what they already have. So she carries on being the best friend she can, but hoping for more, as they go from PLACE TO PLACE.