Chelsea Styles. Sister of the one and only Harry Styles from the band One Direction. Does that ring a bell? After one surprise visit from Chelsea, the 1D members and her friends spend a crazy summer together.. With some relationships made. The Irish leprechaun of 1D falls in love with Chelsea, and Chelsea can't help but feel the same thing to him. But, Harry being the overly protective brother he is, won't let this love take place. Will Chelsea somehow convince Harry to let them be together? If yes, then will Niall keep Chelsea happy or break her heart?