Hanatsukihime by Wataru Hibiki 2 volumes-ongoing
Lys has a flower mark in her chest as proof that the devil owns her heart. In exchange for the beating heart he will take her life when she turns 16. The twist completely caught me off guard. Ohh can't wait! Too early to tell if it's reverse harem but she has a knack of attracting the attention of one local in each town they visit. The art is beautifully detailed but the characters looks distorted at certain angles.