I didn't mention it in the TL note, but Cafe's pose here is also a reference to her in-game skill animation, seen here: https://youtu.be/XuGAyCCtduY?t=4
Arima Kinen
Reference to the Arima Kinen (有馬記念), one of Japan's most famous horse races, located at the Nakayama Racecourse in Chiba. Manhattan Cafe won the 2001 Arima Kinen, marking 2021 as the 10 year anniversary. The date is referring to the day of the 2021 Arima Kinen.
