Io Sakisaka is a Japanese manga artist and character designer born on June 8 in Tokyo. She made her professional debut in 1999 with the short story Sakura, Chiru, and has since built her career primarily with the publisher Shueisha, serializing her works in magazines such as Bessatsu Margaret.

Sakisaka gained significant recognition with her first major series, Strobe Edge, which was published from 2007 to 2010 and later adapted into a live-action film. Her subsequent work, Ao Haru Ride (also known as Blue Spring Ride), ran from 2011 to 2015 and became a substantial success, receiving a 2014 anime television series adaptation by Production I.G, as well as a live-action film. The series was a commercial hit, with its compiled volumes selling millions of copies.

She is also the original creator behind Omoi, Omoware, Furi, Furare (released in English as Love Me, Love Me Not), which was serialized from 2015 to 2019. This work was adapted into an anime film produced by A-1 Pictures that opened in Japan in May 2020, as well as a live-action film. For this series, Sakisaka won the 63rd Shogakukan Manga Award in the shōjo category in 2018. Her other manga include short story collections such as Call My Name and Gate of Planet, and she served as character designer for the 2013 anime film Hal. Her ongoing series, Sakura, Saku, began in 2021.

Her artistic identity is closely associated with the shōjo genre, focusing on the nuances of adolescent romance and emotional growth. Her narratives often center on high school characters navigating first love, unrequited feelings, and the complexities of personal identity. In interviews, she has discussed her interest in exploring contrasting perspectives on love, a theme that was central to Omoi, Omoware, Furi, Furare, which features two heroines with opposing romantic outlooks. Her art style is characterized by fine lines and an emphasis on character expression and gesture to convey emotion.

Sakisaka has become a prominent figure in modern shōjo manga, with her works frequently topping sales charts and receiving multi-platform adaptations, establishing her as a commercially and critically significant creator in the industry.