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【Clearheaded, beautiful, wealthy socialite older sister, yet with the worst personality】

Masato's childhood friend, since the old days she and her younger sister Serina picked on Masato.
Her college, and employment were in Tokyo, so recently they've been estranged, but now she's returned to marry someone rich.
Since the old days her lovely looks and clear intellect have made her a local famous talent, so when she returns, Masato's mother asks her to be his private tutor.
Her twisted nature didn't improve even in Tokyo, and she uses her position as a private tutor to relieve stress by utterly bullying Masato.