Hikaru to Hikaru is a comedy about Hikaru Katsuragi, a boy who is a descendant of the Iga ninja, sneaking into a girls school.

In the Katsuragi family, if you don master the secret Kunoichi no Jutsu, which turns your body into a female body, by the age of 18, you won be recognized as an adult, and his mother was worried about Hikarus immature technique.

In order for such a Hikaru to become a full-fledged woman, he is ordered to attend a prestigious school for young ladies, Kazami Girls School, in the form of a woman.