YoshiYoshi Studio has announced KAELIS: Seraph Protocol, a single-player science-fantasy JRPG in development for PC. The official Steam listing gives the game a 2028 release window and describes a story built around academy life, investigations, turn-based combat and relationships with the Guardians who fight beside the main character.
Players take the role of Kaito, a citizen of Kaelis who becomes an Executor of Serenos Academy. The academy handles incidents involving Noise, a distortion born from the world’s Lumina energy. Kaito investigates those cases with his companions, and the Steam page says his choices, field decisions and enforcement actions can change relationships and influence how individual cases unfold.
Serenos Academy is the game’s central hub
KAELIS presents its city as a peaceful place built around Lumina, a light humanity discovered after a war that left the world in ashes. The official description says Kaelis uses that energy in everyday life, but its stability is not guaranteed. Noise is the visible sign of something changing beneath the city’s orderly surface, giving the academy a reason to investigate locations and incidents across the setting.
Serenos Academy is divided into four specialized divisions. Strike handles field operations and direct combat response. Record studies Noise data, case evidence and abnormal fields. Harmony focuses on resonance stability, team coordination and support, while Veritas researches Lumina and the hidden principles behind the incidents. The divisions are presented as part of the academy’s structure, not as separate playable campaigns.
The format should feel familiar to players who enjoy relationship-led role-playing games, but YoshiYoshi’s listing gives KAELIS a specific mechanical layer. Kaito can build affinity through conversations, academy time and story decisions. Stronger bonds can unlock coordinated attacks and support actions, while the party’s relationships also affect the conditions surrounding some case outcomes.
Combat supports up to four active party members. Every Guardian and Noise is aligned with one of eight Lumina Spectrums: Ignis, Glacies, Fulgur, Terra, Lumina, Umbra, Void and Aether. The Steam page says the Spectrums have different strengths, weaknesses and reactions, so players are expected to identify an enemy’s alignment and bring the right Guardians into the field.
Between missions, Kaito can recover Noise Cores and return them to the academy. The listing says those cores support Lumina Disc development, facility upgrades and Guardian growth. Lumina Discs provide another way to shape a character’s traits and role, which gives academy preparation a direct connection to the next investigation rather than treating the hub as decoration.
The academy also provides room for a more investigative rhythm. Kaito receives missions, reviews case information, gathers clues and enters unstable fields where Noise takes form. The official page says an Armillary Sphere can influence decisive moments through a dice roll, with bonds, discoveries and field decisions changing the conditions around that result. That is a more specific promise than a generic branching-dialogue system, although the developer has not yet explained how many outcomes a case can have.
KAELIS joins a growing group of PC-focused role-playing announcements that ask players to weigh a traditional platform against portability. PixelTempo’s Steam Machine versus PC guide looks at that broader hardware choice, while our gaming handhelds comparison covers the portable side of the decision. Those guides are general hardware context, not confirmation that KAELIS has a Steam Deck rating or a console version.
For now, the confirmed platform is PC through Steam, the target window is 2028, and YoshiYoshi Studio is the listed developer and publisher. The store page does not provide a specific launch date, price or demo, so those details remain open while the studio continues development.
