The chicken sandwich features a chicken thigh filet topped with lettuce, honey mustard, and chocolate sauce and is priced at 390 yen (~$3.81 US)
The chocolate sauce is made with Lotteria's parent company, Lotte's, Ghana Milk Chocolate. According to Rocket News 24, it comes in a separate packet that you add yourself.
The honey mustard is made with a blend of spicy French mustard and grain mustard along with mayo and honey.
The chicken thigh is seasoned with white wine, garlic, and onions and baked slowly.
A non-chocolate version is also available for 340 yen (~$3.32 US).