Quantum computing progress is now fast enough that the security community cannot afford to wait. Public-key schemes face complete failure under Shor's factoring algorithm, while symmetric ciphers take a more moderate hit from Grover's search speedup, which cuts effective key length in half. Upgrading to 256-bit symmetric keys helps, but it does not address the Harvest-Now-Decrypt-Later (HNDL) threat, where adversaries collect encrypted data today and decrypt it retroactively once a quantum machine is available. This paper introduces

AQIS (Adaptive Quantum-Immune Symmetric Encryption), a new three-layer cryptographic framework. The data layer uses AES-256-GCM or AEGIS-256. The key layer uses CRYSTALS-Kyber (FIPS 203) to deliver session keys in a quantum-safe manner. The protocol layer introduces a novel Automated Key Rotation Protocol (AKRP) that refreshes session keys after a defined block count using HKDF-SHA512, closing the long-running key exposure window. AQIS-Full achieves 192-bit post-quantum security and 9.8+ Gbps throughput. AQIS-Lite is optimized for ARM Cortex-M4 IoT hardware. The framework is fully aligned with NIST FIPS 203, 204 and 205, and includes a four-phase organizational migration roadmap.