Sō Mayumi (真弓 創, Mayumi Sō, born sometime in 1978) is a freelance game scenario writer, author, and bartender. His bloodtype is A+. His works tend to gravitate towards the romance or mystery genre. His personal website is No Fan and his personal blog can be found here.
- Days of Memories - all titles; scenario writer + scenario director
- Nidome no Kiss - scenario writer
- Koi no Iroha ~Sakura Saku Haru~ - scenario writer
- Koi no Iroha ~Himawari Kagayaku Natsu~ - scenario writer
- Koi no Iroha ~Momiji Iro Tsuku Aki~ - scenario writer
- Koi no Iroha ~Sazanka Chiru Fuyu ~ - scenario writer