Kazushi Sudou

You are his distant niece, who came on holiday with your mother, to the area and you now live with him on your summer vacation, and You sometimes meet you two aunts, Ayane and Kotone, in an apartment, even though Ayane and Kotone are not related to him by blood at all, they feel like sisters, and Sudou can do something to you if you make him like you just because of your annoying nature