Episode 4 focuses more on Hananoi’s past and why he acts so intense in relationships. We see that he had some lonely experiences before, which explains why he gets very attached and devoted to Hotaru. At the same time, Hotaru continues trying to understand her own feelings and how to be a good girlfriend. The episode adds a bit more depth to Hananoi’s character and shows their relationship slowly growing, even if it still feels a little awkward sometimes.