Flag.1.0 Love Makes the World Go 'Round.Keima Katsuragi is known on the internet for his ability to capture any girl in any bishōjo game, although the girls in real life do not appeal to him. He accidentally accepts a contract with a demon named Elcea de Rux Ima, or Elsie, who wants his help in capturing evil spirits that have escaped from hell and have hidden themselves in girls' hearts. Keima must find a way to make girls fall in love with him in order to force these spirits out, or else both of them will be killed by the magical collars on their necks if the contract is broken. His first target is his classmate named Ayumi Takahara, training for the upcoming track-and-field race. Keima cheers her on by displaying banners using Elsie's magical raiment at the school field each day. When Ayumi is annoyed by his actions, Keima believes she will eventually grow to like him. After a confrontation with jealous upperclasswomen, Ayumi sprains her leg the day before the meet. However, this injury was realized to be a fake since she has doubted her confidence. Keima consoles Ayumi, saying for her to believe in herself. They kissed when Ayumi helps Keima from falling down the stairs, forcing the loose spirit out of her body and allowing Elsie to capture it. Ayumi won the race but lost all of her memories with Keima, she blushes when Keima congratulates her. Much to his confusion, Elsie has transferred to his school, claiming to be his sister.