在这部永不消失的彩虹动画片中,故事发生在一个名为楢崎町的小镇上，这是一个拥有着神秘魔法力量的神奇小镇，在小镇的天空中，永远都挂着一道绚丽的彩虹，而在传说中，神明会实现居住在这个小镇里的人们每人一个愿望。
天海春彦（泰勇气 配音）是从小到大都生活自镇上的青年，一天，班上来了一个名为深峰莉子（清水爱 配音）的转校生，让春彦没有想到的是，这个女孩竟然是自己的义妹，他们在年龄很小的时候分开了，想不到命运的红线令两人于此时此刻重逢。莉子的出现让春彦的青梅竹马木之坂雾乃（宫崎羽衣 配音）感到了强烈的危机感，她一直默默的喜欢着春彦。
The seaside village of Narasakicho is special in a number of strange ways. Crowned by an eternal rainbow, the village is rumored to grant all of its residents a once-in-a-life-time magic ability called a \"gift\". When two hearts are in-sync, the gift of an aspiring love will manifest itself in a wondrous and magical way. A student named Amaumi Haruhiko finds himself entangled in the village's special magic in his 2nd year of high school. His new school year starts with the return of his cute adoptive sister, a morning misadventure with a broom-riding witch and encounters with a number of other cute fellow students.
