Kentarō Satō is a Japanese manga artist and original creator born on December 1, 1986, in Osaka Prefecture. While attending Osaka University of the Arts, he decided to pursue a career in manga. His professional debut came in 2011 when his work Shiritsu Assassin Gakuen was published in Weekly Shōnen Champion as a recipient of the 76th Newcomer Manga Award.

Satō is best known for creating dark fantasy and horror manga, often centered on magical girl themes with a bleak and violent tone. His first serialized work, Magical Girl of the End (Mahō Shōjo of the End), ran in Bessatsu Shōnen Champion from its inaugural issue in 2012 until 2017, spanning 16 volumes.

He achieved wider recognition with his second major series, Magical Girl Site, which began serialization on the web platform Champion Tap! in July 2013. The series was later transferred to the print magazine Weekly Shōnen Champion in October 2017 and concluded in August 2019, with a total of 16 collected volumes. The story follows a middle school girl who gains magical powers from a mysterious website but soon discovers that using these powers comes at the cost of her own lifespan. A television anime adaptation, produced by production dóA, aired from April to June 2018. Satō himself provided the voice for the character Sōji Odano in the anime. A spin-off manga titled Magical Girl Site Sept, for which Satō served as the original creator with artist Toshinori Sogabe handling the illustrations, was serialized from 2017 to 2018 and compiled into two volumes.

Beyond the Magical Girl Site franchise, Satō continued to produce original works. He created Immortality and Punishment (Fushi to Batsu), a panic horror manga serialized in Bessatsu Shōnen Champion from December 2021 to April 2025 and collected in eight volumes. In 2023, he began collaborating with writer Shin Miyazuki on Our Summer is Tearing Apart (Bokura no Natsu ga Saketeiku), which was serialized in Young Animal until 2025. He has also contributed original concepts and story for works illustrated by other artists, including the one-shot Chō Kusobaba in 2015.

Satō's artistic identity is defined by his exploration of dark, psychological themes within the magical girl genre, subverting its traditional associations with hope and justice. His works consistently feature protagonists who are victims of extreme misfortune and depict the acquisition of power as a double-edged sword that brings further suffering. This focus on tragedy and the consequences of violence has established him as a significant figure in the dark magical girl subgenre.