The Citrus Set in the Animal Crossing series consists of four fruit-inspired furniture items and first appeared in Doubutsu no Mori. The Citrus Wall and Citrus Carpet complement the set, however they are not considered part of the set for HHA score calculation purposes.
Doubutsu no Mori, Doubutsu no Mori+, Animal Crossing, and Doubutsu no Mori e+
Animal Crossing: Wild World
Animal Crossing: City Folk
Animal Crossing: New Leaf