When Tianxia No. 1 and Tianxia No. 1 fall in love, what will happen to the world? This is a story about martial arts and a troublesome girl, routine and being dealt with routinely, acting like a prick and the reverse. This is Tianxia. Do you dare to ask "Tianxia No. what?"

An alien from Saturn tries to make a normal human girl fall in love with him so that she will help him betray Earth.