[Q] "Your Japanese is very good!"
the most realistic Japanese response
unexpected 1:1 interactions are the most terrifying in this state. yes, Hanako just decided to focus on making friends, but she might also be worried that people would misinterpret her attempts at friendship, even more so with a language barrier (but hey, not wanting to be misunderstood could be a neat thing to bond over with our Russian-speaking acquaintance). I could see this going either way but I'm inclined to go for the scared response.
[X] Just fucking run.