Cinderella Summer Tour 2021 in Tokyo ~ Day 2 was a professional wrestling event promoted by World Wonder Ring Stardom, held on July 17, 2021 at Belle Salle Takadanobaba in Tokyo, Japan. In the main event, STARS' leader Mayu Iwatani attempted to recapture Starlight Kid, recently lost to the dastardly Oedo Tai during a stipulation match, in an intense 5-on-1 gauntlet against the faction. Notably, three other members of Oedo Tai were part of STARS before either being taken, like Kid, or specifically betraying Iwatani.