The Earth is in danger – aliens from another dimension, simply by appearing in our world, bring terrible disasters. They have landed, as is customary, in the Land of the Rising Sun, and people quickly grew used to the fact that besides tsunamis and underground tremors one must also fear "space disturbances." Yes, the ostrich method can"t solve the problem; should we fight to the death with unfamiliar guests? Of course, there are mobile groups equipped with modern weapons, but the solution lies elsewhere. The key to it, if anyone hasn"t guessed, is a regular Japanese schoolboy! Sixteen‑year‑old Sido Itza lost his parents in early childhood and now lives with his younger sister Kotori in the suburbs of Tokyo. One day, out of concern for his sister, Itza found himself right in the epicenter of a catastrophe and learned that unknown Spirits come to Earth… exclusively in the form of cute girls! The template break was completed by a "sister," who turned out to be the commander of a secret combat group. She told poor Sido that only he can seal the destructive powers of the Spirits, but on one condition – the girl must love him sincerely! This is a state affair, so the young fighter"s course awaits no joke – and further there is a chance to tie up the belt of the very Keimu Katsuragi.