Life is already complicated for teenager Usagi Tsukino, yet it only grows more complex after a talking cat named Luna informs her she is Sailor Moon, a superheroine destined to protect the galaxy and find the long-lost princess of the Silver Millennium, the lost Moon Kingdom. Other than fighting the many foes sent to attack Earth, Usagi must also team up with the other Sailor Guardians, though some are harder to recruit as allies than others during the events of the Sailor Moon storyline. With her loyalty and compassion never ceasing, however, Sailor Moon proves to be the legendary heroine the world needs most.

In Sailor Moon Cosmos, the final part of the Sailor Moon Crystal reboot, Usagi and her friends appear to have entered an era of peace when Mamoru Chiba, Usagi's boyfriend, suddenly vanishes in front of her eyes. This is revealed to be the work of Sailor Galaxia,...