Ep. 1: Koto Hoshino encounters ancient city and Tagitsuhime after picking up cosmo breath

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High school student Koto Hoshino accidentally acquires a cosmo breath during a school trip to Izumo. Guided by an unseen force, the ancient city ascends toward an old temple. Upon the city's awakening, all other people vanish from existence. Simultaneously, Tagitsuhime, the daughter of the sun god Amaterasu, makes her appearance. This sequence of events marks the Resurrection of Black, setting off a mysterious chain of occurrences that leaves Koto Hoshino isolated amidst the sudden disappearance of everyone else. The narrative focuses on these supernatural elements and the sudden arrival of the divine figure in this altered reality.