Ruri, the protagonist, grew up believing she was just an ordinary girl, but suddenly a crest appears on her chest. She bares her chest in front of her childhood friend, Ken-chan. Before she knows it, her physical abilities have dramatically increased. When Ruri turns 16, people from all over the world will come to take her away. What will become of Ruri? Can Ken-chan protect her? A slightly erotic modern fantasy. Enjoy this slapstick comedy!