Kaelis: Seraph Protocol is coming to PC in 2028 with a mix of academy life, character relationships and turn-based combat. YoshiYoshi Studio revealed the sci-fantasy JRPG on September 18 and introduced Kaito, a student who becomes an Executor at Serenos Academy.

Kaito lives in Kaelis, humanity’s last city after a war destroyed the old world. The city survives through an energy called Lumina, but that same energy can become unstable and create dangerous distortions known as Noise. Executors investigate those incidents, enter affected areas and recover Noise Cores before the problem spreads.

Three Guardian cards appear on the Lumina Link screen in Kaelis.
Lumina Link presents Reina, Amane and Kotoha as possible companions. · Credit: YoshiYoshi Studio

Guardians are friends and party members

Kaito does not work alone. Serenos Academy brings together Guardians from four divisions that handle combat, evidence, support and Lumina research. The first material introduces Reina, Amane and Kotoha, each with a different look, role and set of abilities.

Conversations and time spent together can raise Kaito’s bond with a Guardian. Stronger bonds can unlock coordinated attacks, support actions and better party teamwork. The game also says choices may reveal different sides of the characters during the story.

Three Guardians face a mechanical enemy in a sharp Kaelis turn-based battle screenshot.
Each Guardian uses Lumina skills tied to one or two elemental Spectrums. · Credit: YoshiYoshi Studio

How the turn-based battles work

Players can take up to four active party members into a fight. Every Guardian and enemy is connected to one of eight Lumina Spectrums: Ignis, Glacies, Fulgur, Terra, Lumina, Umbra, Void and Aether. The basic goal is to learn an enemy’s Spectrum and bring Guardians who can answer it.

Recovered Noise Cores also have a use back at the academy. They can support new Lumina Discs, facility upgrades and Guardian growth. The loop moves between investigation, battle and preparation instead of treating the academy as a separate menu.

Ice and glowing energy surround enemies during a Kaelis battle.
Matching a party to an enemy’s Spectrum is part of the combat strategy. · Credit: YoshiYoshi Studio

The Armillary Sphere can change a case

The most unusual system is the Armillary Sphere. During important moments, the device rolls a die. Kaito’s earlier bonds, discoveries and field decisions can change the conditions of that roll, which may affect how an incident ends.

Kaito stands beside a mechanical sphere and a die while three choices appear on screen.
The Armillary Sphere turns important decisions into a dice roll affected by earlier choices. · Credit: YoshiYoshi Studio

Players also choose Kaito’s responses in quieter conversations. Those choices can strengthen a friendship or change the tone of a scene. The official description does not promise a fully branching story, but it clearly says that decisions leave marks on individual cases.

Kaito inspects a Lumina Core inside overgrown ruins during an academy mission.
Executors enter unstable fields to inspect Lumina Cores and investigate Noise incidents. · Credit: YoshiYoshi Studio

Kaelis: Seraph Protocol is currently announced for PC through Steam. The store lists a broad 2028 release window, with no exact date or console versions confirmed. YoshiYoshi Studio is both the developer and publisher. The early footage already shows the main idea clearly: solve Noise cases, build a dependable team and carry those relationships into battle.