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.
Director and writer George Kamitani conceived the game in 2013 following the completion of Dragon's Crown, originally pitching it for a toy line. 13 Sentinels began production two years later, discarding the toy line element under Atlus. The production proved challenging for Vanillaware, as the studio dealt with workload and development challenges. Contrary to previous works, Kamitani both worked on the script alone and handed character design duties to Yukiko Hirai and Emika Kida. Hitoshi Sakimoto and his studio Basiscape, who handled the music for Vanillaware's past games, revisited their roles.
Originally scheduled for a 2018 release on both the PlayStation 4 and PlayStation Vita, the game was delayed to 2019 with the Vita version being canceled. The English localization by Atlus West proved challenging due to the COVID-19 pandemic. It saw a slow start in sales upon its release in Japan before eventually exceeding Atlus's expectations, with shipments and digital sales reaching one million units by 2023. Critical reception has been generally positive, with praise going to its narrative and art design, though several reviewers faulted the RTS segments as the weakest part of the game.
Gameplay
13 Sentinels: Aegis Rim is a video game where players take control of thirteen different characters, who interact with each other to build a larger narrative. The gameplay is split into three sections. They are Remembrance, with exploration and dialogue taking priority and advancing the narrative; Destruction, where characters equip mecha and engage in battles against enemies called Kaiju; and Analysis, a glossary which documents event scenes and important items and characters.
During the adventure game-style Remembrance segments, the player explores two-dimensional (2D) side-scrolling environments, interacting with elements of those environments in a non-linear manner. Several elements move in real-time regardless of the player's actions, and choices can be made which alter the outcome of some scenes. Keywords spoken by characters and obtained items are added to a Thought Cloud database, which can be accessed to trigger both internal monologues and initiate new dialogue. Once learned, keywords are carried over into other earlier or parallel scenes, which in turn unlock further story routes and options. The character stories are tracked with a flowchart, with players able to jump between scenes to try different keywords from the Thought Cloud. If a wrong choice is made during one section, the game rewinds back to the beginning of the day so players can select the right choice. To reach that point faster, events the player has already seen can be fast forwarded.
The battle system of the Destruction mode takes the form of a real-time strategy scenario, with up to six chosen characters using Sentinels to fight off waves of Kaiju defending a terminal. The terminal's health is determined by which units are in place, and if all units are defeated, the hub is overwhelmed and the game ends. Gameplay can be paused, allowing for Sentinels to be moved and actions such as combat and support abilities to be carried out. The section is completed when the hub is successfully defended against all waves. Battles pit Sentinels against Kaiju with differing strengths and abilities such as flight or extra defense, requiring one of the four Sentinel types; some Sentinels are strong against flying enemies, while others do better against large ground-based forces. They also have different attack ranges and movement speeds. Sentinels have at least one basic attack that costs nothing, and additional abilities that cost a resource called EP; EP can be recovered by defending. After acting, each Sentinel has a cooldown timer before it can act again. Damage can be repaired by Sentinel pilots, but this requires leaving the Sentinel and leaving them vulnerable to attack. The player can also trigger limited-use "Terminal Commands", special field-wide abilities such as an EMP which use up a dedicated energy gauge. Characters level up with experience points and gain passive bonus effects, while Sentinel abilities and attributes can be raised using Meta-chips gained during battles.