They are two split personalities within one body, who happen to have different appearances and opposing personalities. Lilis is sweet, kind, but airheaded and also an accurate fortune-teller, whereas Lilie is mischievous, rude, and acts like a tsundere. She also enjoys to cleverly annoy and irritate others when she does fortune telling. Their personality switches fromwhen they hit their head, or when something mentally shocking happens. (Source: Conception Wikia)