|Sakaguchi Kazuki坂口 一樹|
|Body||Pale, Slim, Teen|
|Clothes||Baggy Pants, Blazer, Loafers, School Uniform, Shirt, T-shirt|
|Personality||Altruistic, Boku, Friendly, Hardworker, Henpecked, Kind, Otaku|
|Role||Childhood Friend, High School Student, Lonely|
|Visual novels||Protagonist - Gal Shojo!?|
Kazuki is the childhood friend of Tomoka and one of her classmate. He also knows Saki through Tomoka but they doesn't really see each other. They was good friends before and Kazuki even propose to her, but since they start middle school, she becames more distant to him and she adopted the gyaru life style.