In a world where Logic governs emotions, abilities, and more, alien 'Foreigners' exploit portals infused with their world's Logic to endanger other realms. To safeguard against this, the Another Logic Counter Agency (ALCA) enlists 'Logicalists' from Septpia, individuals capable of bonding with peace-seeking Foreigners to thwart potential threats. Yoshichika Tsurugi, having lost his combat Logic abilities due to a past power surge, leads an ordinary life until encountering Athena, a goddess from Tetra-Heaven. With his missing Logic Card restored by Athena, Yoshichika regains his Logicalist status, forging a pact with her to join ALCA. As he collaborates with fellow Logicalists, Yoshichika aims to eliminate the looming dangers, relying on teamwork to secure peace across worlds.