Osamu Igarashi (五十嵐 修 Igarashi Osamu) is a professional karuta reader. He is the foremost authority on karuta reading and the voice on the CD used for practice. He is a 7th dan karuta player. He also known to have a perfect rhythm, clear sound and a modulation that women are incapable of producing. He also uses his smartphone as a stopwatch to keep his perfect rhythm.
He is the head of the Shiranami Karuta Society. As fellow karuta players, they have not played each other for a long time. They only got to have a match again during Chihaya's time at the East Japan Meijin/Queen Qualifiers.