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Artist's commentary
From the original commentary:
Q. Whose form is she mimicking? (Hint: He played in the final stage of the Climax Series as a team pitcher.)
From the post commentary:
Today is the sixth match of the Japan Series. The illustration is of the Swallows' pitcher Ogawa Yasuhiro's pitching form from when he claimed victory in the first match of the Japan Series, and today is making his second starting appearance.