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Kana, who has never met her grandfather in her life, finds out that his house is near the school she attends. Her mother repeatedly tells her not to meet him, but out of curiosity she decides to visit. A kind-looking man comes out. When she tells him she is his grandson, he welcomes her into the house with a happy look on his face, and they enjoy talking about old times over tea. "I thought he was a mean guy, but maybe I was mistaken," she thinks, but then...