On the isolated island of Tatsumiya, life seems like a peaceful dream. This illusion is shattered by the arrival of the Festum, a mysterious alien force that seeks to assimilate humanity and erase all individuality. The island’s only hope lies with a group of teenagers chosen to pilot giant mechs called Fafners. However, this is no glorious war. Piloting a Fafner comes at a terrible cost, inflicting a debilitating "assimilation phenomenon" upon the pilots. They must fight not only the enemy but also the very machines that protect them, confronting immense pain, loss, and the philosophical question of what it means to exist. The broadcast of Fafner in the Azure has ended, but sign up for a reminder just in case it returns.