From JoJo’s tweet on 15 July, 2017:
JoJo’s Bizarre Adventure × Ikinari! Steak collaboration starts today❗️
The「Great! Fillet Steak」is sold exclusively at the Akasaka Sacas shop?
Upon gathering 6 stamps in the Ikinari! Steak app, you may apply to win prizes including a poster signed by Yamazaki-san✨
Campaign runs till 31 Aug❗️