(A Ranma 1/2 - XCOM crossover)

Months after the failed wedding, at the end of the manga, the chaos of Nerima seemed to be fading away. With some of the cast graduating and leaving, others resigned to the inevitable pairing that would unite the Tendo and Saotome schools, and yet others apparently moving on with their lives, it almost seems like normalcy. However, unknown to any of them, a Secret War has waged since the turn of the century - a war of survival between humanity and malevolent visitors from beyond the stars. Such a blissful ignorance could only last so long, especially with the conflict in the Far East between man and monster rising to a fever pitch.

This is the story of how the Nerima Wrecking Crew brought the war to the enemy.

It all begins on a sleepy farm in the Japanese countryside...