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The elder of the Nawashiro sisters.
They were shipwrecked while traveling. She and her younger sister Minori drifted ashore onto the island.

Greedy for pleasure. She also has a perverted nature.
Furthermore she's a masochist, and since drifting ashore onto the island, which is home to suspicious flora and fauna, she has been actively satisfying her desires in that area.

So, after meeting Reijirou, she's more than willing to initiate sex in order to escape, but she also doesn't want to leave the island.

She's also half irritated and half worried as a big sister, getting a bad feeling about her straight-laced little sister Minori who is too naive with Reijirou.

Also has a sadistic idea that she wants to give her little sister a chance to become more assertive, and for her to have that same taste of pleasure to her heart's content.