The real indicator that he likes her is not that he goes BADUMP BADUMP whenever he sees the sword, but that he WANTED the badump badump to mean that he liked her 😂
It's a bit slow in the beginning and Mary Sue-y, but it gets better fast and I'm solidly enjoying it now :)
Spoiler only up to Ch. 47 ish: Arial is so much like a villainess isekai character 😂I could love her given the right chance