Gan Sunaaku (砂 阿久雁 Suna'aku Gan) is a Japanese writer. As a writer, he is well known for his work in the manga Attack on Titan: No Regrets, an spin-off manga of Attack on Titan, which is extreme demanded. He has helped Gen Urobuchi in writing script for episode 10 of Kamen Rider Gaim, and yet-to-be the main writer of Kamen Rider Gaim (novel).