This set includes costumes and accessories that can be worn by the characters. It features the following items:
-Ruka Exclusive Costume “Japanese Swimsuit”
-Misaki Exclusive Costume “Dancer Swimsuit”
-Ruka Exclusive Costume “Chinese Evening Dress (Emerald)”
-Misaki Exclusive Costume “Chinese Evening Dress (Crimson)”
-Ruka Exclusive Costume “Nightwear (Blue)”
-Misaki Exclusive Costume “Nightwear (Pink)”
-Choshiro Exclusive Costume “Rash Guard & Surf Shorts”
-Ruka Exclusive Accessory “Cat Ears (White)”
-Misaki Exclusive Accessory “Cat Ears (Black)”
-Choshiro Exclusive Accessory “Detective's Hat”
-Ruka Exclusive Accessory “Organ Mask (Rogetsu Kagura - Vocal)”
-Misaki Exclusive Accessory “Organ Mask (Rogetsu Kagura - Bell)”
-Madoka Exclusive Accessory “Organ Mask (Rogetsu Kagura - Strings)”

More details on the official game page of Rogetsu Isle Dinner Party Costume Set ...