Purchase
You give a shellfish to a lifeguard to purchase their services. You think lifeguards are interested in normal money? Come on, they're obviously out there using shellfish for their purchases. It's only natural, given their seaside habitat.
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This time you purchase some こういち goods. You know, since you're such a fan. How else can you show love in this world, if not through purchases? The lifeguard hands over a little haul of こういち plushies and figurines. Nice.