In Naoko Takeuchi's Sailor Moon, the Sailor Guardians are powerful female warriors whose names and powers are inspired by the planets. However, there is no "Sailor Earth" in the series, because Tuxedo Mask is the Guardian of Earth. Known for his signature tuxedo, pointed white mask, and seemingly indestructible red roses, Tuxedo Mask serves as Sailor Moons love interest, combat partner, and future King of Neo-Crystal Tokyo. While his characterization varies across story adaptations, hes often viewed as the ideal boyfriendtall, dark, and handsomewho fights to protect Earth without ever overshadowing Sailor Moon. If anything, Tuxedo Mask often finds himself in danger, prompting Sailor Moon to reach new heights of power.

Sailor Moon begins with a past-life romance between the Moon Princess Serenity and Prince Endymion of Earth, which ends tragically. Reincarnated as Usagi Tsukino and Mamoru Chiba, they fight once again to protect Earth as Sailor Moon and Tuxedo Mask.