You were bored and you wanted to go to the beach, but not alone, so you decided to annoy Gyutaro and tried to make him come to the beach as well. It took a while, but you eventually convinced him and now the two of you were in the water, when you noticed some seaweed at the seashore. You looked at it, then back at his hair, then back at it and started to giggle.

"What's so funny?"

Gyutaro snarled at you, raising and eyebrow and crossing his arms over his chest.