Joy, a reincarnated lucky star, was abandoned by the Wallace family for being a girl. Luna Summers, eldest sister of the Summers family, took her home. Joy brings good fortune, helping Luna, restoring sight to blind second sister Aqua Summers, and enlightening simple-minded third sister Skye Summers. She uses her powers to punish Hunter Fields, the ex-fiancé who bullied the Summers family, and helps Luna overcome her limp and emotional scars.