Ymir and Historia have been in love with each other since they met as kids, though both think the other doesn't feel the same despite them having a relationship that blurred the lines of friendship. Ymir wasn't one for words, preferably showing how they felt through actions but Historia was the exact opposite, never the best at interpreting actions and needed things to be outright said to them, which neither understood about the other. however, when Historia steps out of her shell and starts talking and hanging out with people Ymir is not familiar with, her jealousy grows far beyond her control, to the point where they start trying to prevent Historia from hanging around anyone else in fear of Historia forming a closer bond with someone other than Ymir. Historia eventually notices and starts to get annoyed to the point of confrontation.
