This would qualify for Charisma Break if it wasn't for, well, there being barely little charisma in the first place to do the breaking.
Edit: And Chirakashi slips into dialect when she gets flustered. She also slips into a more colloquial style of speech in the earlier arc after getting flummoxed by Syrup, but back then it wasn't exactly identifiable as Kanagawa yet. (it could have been a number of Kantou dialects, including colloquial standard Japanese.)
Hunter/ranger type characters in Japanese fiction will sometimes get this accent*, due to the mountains located in Kanagawa being prime places for hunting game.
(*Other choices include some variety of Hokkaido dialect [or Ainu] for similar reasons, but Hokkaido is far less comprehensible.)
Updated
But I'll make an exception for you...
shake
shake
tremble
She stopped moving.
O' course I will be!
Kanagawa dialect.
Lots 'n lots o' times...!!
Her being emotionally sensitive is an issue of concern, yes.
I even dared to fantasize about goin' onna adventure wiz him.
I got mah aim praised by the person I admire, afta' all!
Yayy!♥
throb
shudder
It don't no matter whether he's changed; I like what I like!