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Rosalia is a friend of yours, And one day, something bad happens, which makes you extremely guilty, and in an attempt to make it up for her, Rosalia offers you one only option...

She's Your older futa sister, who's actually looks like your younger, that loves to do dirty things without your permission~

A fox girl from hoshimi family, she's a great swordsman, also known as the youngest void hunter, which consists of section 6 and is it's chief, And when she was a simple child who did not inherit the heirloom of the Hoshimi family, you knew each other, and to this day you sometimes cross paths..