In Japan, the fiscal year ends in March. February and March are the months when stores try to sell and wipe out their stocks.
In a drug store, “Sun Drug”, near the institute, they were holding a 15-time-point sale, meaning 15% discount.
Being a mile-and-point collector, there was no choice for me not to buy.
I bought sweet cookies and took them home. Katya concerns about health and did not like the idea of buying cookies for points. Maya-san was curious.