50 monster girls from the previous game reappear, as well as 30 additional new ones. Crystal also features different endings specific to different monster girls, with each of the 80 girls having a separate ending. Upon meeting certain prerequisites, it is possible to go inside the heart of a specific monster girl in a dungeon called the "Depths Domain"; clearing it unlocks a variety of different things for the said character. Unlike Moero Chronicle, where character costumes of bras and panties came in a set, Crystal allows players to mix and match thus creating different costume combinations. Additionally, players can visit monster girls to gift them presents, as well as visit the in-game inn.
