That could be a mantra for OK. The sisters have created an accompanying book that involves their Tokyo friends. "We wanted to make the book very special and artsy, with the art and visuals being very creative," says Mizuhara. "So we used [Tokyo photographer] Monika Mogi; she's my best friend and so talented."

All of which gives OK a collective sense. "I think OK is like a platform for girls to have a feeling of belonging and friendship, and I feel like we didn't really have that feeling in Asia yet; it's a sort of girl-power feeling to the brand," says Mizuhara. With openings in Hong Kong and Taiwan, OK is also launching in Indonesia and Thailand. "So far, it's been amazing to see all of these girls enjoying our products and just being themselves."

In the meantime, Mizuhara's OK will soon debut a collaboration with iconic Japanese shoe brand Esperanza from October 1; OK is also in discussions with Opening Ceremony. "They want to do something in Los Angeles," she says. The multifaceted and much-in-demand Mizuhara also mentions upcoming projects with a transgender artist, a potential photo exhibition and a book with Yuka. For would-be Mizuharas in the making, head to Hysan Avenue before September 18; thereafter, I.T Blue Block will continue to sell Mizuhara's wearable happiness as part of its retail attractions. And that's A-OK with us.