"Castella is a type of Japanese sponge cake and is known for its sweet, moist brioche-style flavour and texture. It is based on cakes introduced to Japan by Portuguese merchants in the 16th century. To suit the tastes of Japanese people, mizuame syrup was added to the sponge cake to make it more moist, and zarame was added to the bottom to give it a coarser texture."
I didn't play the game but I have to know why Castella