He was about to use Seigi no Tekken, when Kidou reminded him that he cannot use his hands outside the penalty area. So he just used his head to block the shot. Then a makeshift of a fist appeared, which made Coach Hitomiko think of making Endou a libero. Later, Endou trained to perfect this move. This eventually becomes one of the moves he uses when he is a libero. When making this move, Endou first concentrates power in his head and Megaton Head is clenched. Even though its used defensively, Endou also uses this for offense as seen in the fight when Diamond Dust and Prominence combined forces, he used the same movements in striking the ball. It was seen to be very powerful as it went in the goal.
This hissatsu evolved in G2 in episode 96. Later, it evolved into G3 and scored the final goal in the match against Dark Angel.