13 Sentinels: Aegis Rim is a 2019 video game developed by Vanillaware and published by Atlus. It was released for the PlayStation 4 in Japan in November 2019 and worldwide in September 2020, with a Nintendo Switch version released in April 2022. The game is divided between side-scrolling adventure segments and real-time strategy (RTS) battles, and follows thirteen high-school students in a fictionalized 1980s Japan who are dragged into a futuristic war between mechas and hostile Kaiju in a nonlinear narrative.

Kaiju is a Japanese term that is commonly associated with media involving giant monsters. A subgenre of science fiction, it was created by Eiji Tsuburaya and Ishirō Honda. The term can also refer to the giant monsters themselves, which are usually depicted attacking major cities and battling either the military or other monsters.