Kaiya quickly bows her head to the stranger she almost crashed into, flashing him an apologetic grin before turning back to her sister, laughing, "Yes, yes. I won't." Matching Zuki's pace, she kept relatively quiet at the supermarket, leisurely shopping while inconspicuously keeping watch on the stranger from before. Suspicious, she contemplated taking a complicated route and blending into the rest of the other customers to shake him off, but decided against it and only continued her quest for her treats.