|Japanese name:||紫芝 菜月|
|Faction:||Kiyosumi Student Congress|
|School:||Kiyosumi High School|
|Grade:||Second-year high school|
|Debut:||Saki, round 67|
Natsuki has short black hair with two pigtails in the back. She has wears the standard Kiyosumi High uniform.
Natsuki first appears with her friend as they greet Hisa Takei, however this was changed in the anime into two random students.
National Tournament Arc
She and Ayano Teradaira are among the first to wish Hisa good luck when the Ichita Naiki handed them the phone during a call. She also is among the many watching the Kiyosumi mahjong team on the projector in the Kiyosumi gym.