A "Uniform Alt. Color" costume is added for Ao, Kokoro, Rena, Yuki, Shiho, Hinako, Kirara, Hiori, Mio, and Uta, for a total of 10 varieties.

Note: After unlocking the Change Outfit function for the poolside "Locker Room", you can change into the costumes from the lockers inside the "Locker Room". (The corresponding girl must also be one of your friends.)
Note: For details about content, please visit the official site.
Note: This product is a DLC set product for those who purchased the "BLUE REFLECTION: Second Light Digital Deluxe Edition" or "BLUE REFLECTION: Second Light Ultimate Edition".

More details on the official game page of Uniform Alt. Color - Costume Set ...