Part 3 of The Record of a Sassy, Sporty Girl Being Turned Into a Gyaru!
Commissioned and edited by myself, translated by Rinruririn.
TL Note for page 23: He literally says, "Listen, Reika-chan. A shitty gyaru like you shouldn't use 'watashi' to refer to yourself. You should say 'uchi' like you're stupid."
'Watashi' is the standard way of saying 'I' in Japanese. 'Uchi' also translates to 'I' in English, but the implication here is that it sounds more low-class and stupid.