Ishida and Asakura - S1.E12

Ishida try to save Asakura which fell from the bridge. With burst of superhuman strength he throws him into atmosphere, accidentally hitting an UFO. Naked Asakura (whose clothes burned during flight through atmosphere) and Ishida are then found by teachers and colleagues, who confirm, that somebody shot down an UFO. Later on all girls with Kinoshita-sensei are on board of another UFO, but planned alien invasion on Earth was stopped by Kinoshita-sensei.