Nano Invaders follows the eye-popping adventures of Hikaru, 11, who is dragged into a series of battles between two rival alien clans. One day Hikaru tries on a bracelet that belongs to his classmate Mimi and he turns into a monster. Mimi’s family is a special scouting unit from planet Anima. When alien invaders from a rival planet Damon attack the city, Hikaru joins force with Mimi’s family to fight back. The battle gets on the TV, making Hikaru and the aliens instant heroes. Simple-minded Hikaru is happy to see his dream come true, not knowing that Mimi’s family is plotting to take over the earth too!

在身为消防员的父亲因公殉职后，11岁的地球男孩小光便和妈妈一同生活着。小光承袭了父亲的强健体魄和救人于危难时的果敢与热忱，非但没有因为父亲的离世而意志消沉，反而更坚定了他想要像爸爸那样英勇救助他人的志向。平时喜好研究外星生物的他，一直梦想着有朝一日能够成为比爸爸更伟大的英雄！而这个梦想似乎正在逐步化为现实，因为他在无意间卷入了一场两个不同外星球争夺对地球的掌控大战之中。