Keiko (ケイコ), is a character in Tsuyoshi Shikkari Shinasai Taisen Puzzle Dama.
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Keiko is a dog that was given to Tsuyoshi from one of his friend. Tsuyoshi unofficially named the dog after his sister, Keiko, although he never calls the dog, Keiko, when his sister is around. Despite having a girl's name, the dog is in reality a male.