Continuing from the story of Operation Originium Dust, Operation Lucent Arrowhead tells of another squad of Team Rainbow, "Ela" Elżbieta Bosak, "Fuze" Shuhrat Kessikbayev, "Iana" Nienke Meijer, and "Doc" Gustave Kateb, arriving on Terra following the Magnethill incident. Upon arriving at Dossoles, the squad are tasked to work as body guards for the Galería Krysztauowa, but they will turn against their will to fight for justice while an art movement in a slum are voicing out their rage against the art conglomerate.

Months have passed since Ash’s squad suddenly vanished at Magnethill-2 bunker at the Ural Mountains. Being the witnesses of their disappearance, Ela and Iana bring Fuze and Doc for the investigation, and the latter are unpersuaded of the incident. Suddenly, an earthquake occurs around the bunker’s site, and the squad are drawn into the impact of the earthquake. The squad find themselves falling down until they break the building’s ceiling and land on the floor. Upon climbing out from the ruin, they find themselves in the middle of a hostage battle surrounded by hostile soldiers, but they easily clear out the hostiles and evacuate the hostage safely.

The squad are bewildered by their surroundings. Doc discovers these people possess dog-like ears and tails, Fuze curses that they are not at the frigid Urals but some tropical site like the Maldives, and Iana is shocked to see two moons appearing in the darkening sky. They realize they are now in a totally alien world, not on Earth. The two freed hostages, introducing themselves as Reynell Kowalski, curator of Galería Krysztauowa, and his loyal bodyguard Miłosz, introduce to these “Sankta”-like alien squad that they are now on Terra, somewhere in Dossoles, Bolívar.

Further cover of the synopsis could be read at: https://arknights.wiki.gg/wiki/Operation_Lucent_Arrowhead/Synopsis