This escalated in ways I never expected it to. God bless Jetto-san.
She gives out T-points...
T-points are related to Japanese retailer Tsutaya but are also usable at other places, most notably Family Mart for this comic. Do you have a T-point card?
She's buying them...
Um... do you have change for 1000 Yen?
She's selling them...
...Uh, then... that'll be 540 Yen...Sorry... I've never done that before, so I didn't prepare anything to exchange....Sumireko-chan! Let's exchange friendship chocolates!