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Strange as it may seem, Sumire really enjoyed pissing Kinako off. It wasn't because she liked being mean all day long, but simply because when her emotions got the better of her, she became such a confident person, ready to do anything to defend herself and her convictions, that Sumire would do it again and again to see it. She had to find the balance between making her leave without an apology and making sure she didn't hang up on her. Her talent as an actress helped her enormously.
It was a game she really could not get enough of.