With chapter 22 now Im more hyped than ever with this title, so this is my first reread and omg I forgot how good the 1st chapter is. Im so used to see Frieren being cold faced and unfazed most of the time that I forgot she was so livid and brighter in this chapter, and you can really see that Frieren is actually a lot more friendly that she herself realizes (I bet she wasn't aware of all those smiles she did with her party)
Seeing Frieren's reaction to Himmel's death and the whole stuff about not really understand/know him (and her party) compared to her behaviour on later chapters let you reralize that Frieren is now slowly understanding more her old companions. And with all those hints that Himmel is actually more special to Frieren than she herself is able to accept/undestand I bet there is gonna be an exact moment in this series were she is gonna realize this and is gonna hurt a LOT
(And as many people already tried to theorize, I also think that Himmel had a thing for Frieren/was interested romantically in her, and I really wanna see how she is gonna react with that)