I'm not confident enough to add this as an actual translation note, but I think Miharu in the third panel is implying the sunscreen the producer brought isn't strong enough. The two bottles seem to be SPF 30 and SPF 50, and Miharu may want something that provides more protection like SPF 70. SPF 50 is enough protection for most people, but Miharu is an idol, so it would make sense for her to be extra careful.