Cinderella Summer Tour 2021 in Tokyo ~ Day 1 was a professional wrestling event promoted by World Wonder Ring Stardom, held on July 6, 2021 at Korakuen Hall in Tokyo, Japan. In the main event, Cosmic Angels (Tam Nakano, Unagi Sayaka and Mina Shirakawa) defended the Artist of Stardom Championship against members of Queen's Quest (Utami Hayashishita, Saya Kamitani and AZM).