Is 304 shocking to anyone else?! Ed and Elisha being close prior to her becoming an exchange student, and also conversing primarily in Japanese way back then (I read the raws a few weeks ago-- only Ed's "Noooo, oh God" is written in English). I usually love the effort at cross-cultural details in this manga, like the example of Elisha naturally using dollars and Honoka having to convert it to yen in this same chapter. So the sudden lack of detail in this development kind of bummed me out.
Then again, it more or less serves to give an explanation for why she's staying with him in the first place; he's a family friend or relative and she had visited him previously. I may be a tad overly invested in the general worldbuilding and continuity in this manga lol