Ansatsu Kyoushitsu

In the blink of an eye, the night sky is forever changed when, with a great explosion, the moon is blasted into a permanent crescent. Confronting the governments of the world, a yellow tentacled monster boasts that it was the one responsible for the catastrophe, and in a year's time, it will do the same to Earth. Zooming around at Mach 20, the creature makes a peculiar demand: a teaching position ...