What do you think you’re doing, Hideki-kun?

Ogawa Hideki is a high school boy that has a disease called "Disease XX" which, when triggered makes him a pervert.

Because of his unknown disease, Hideki's parents transferred him to a different country that offers a free medication in order to cure him.

Several years passed by and his parents transferred him back in their home because they thought that his disease is gone, but the truth is, his disease is still active.

After his transfer, he goes to the nearest manga shop and accidentally met a weird girl.

Who is this weird and beautiful girl? Will this girl change his life?