The Hissatsu Triangle Z! (必殺のトライアングルＺ！, Hissatsu no Toraianguru Z!) is the 20th episode of the Inazuma Eleven series.
Raimon are getting ready to play their next big opponent - Kidokawa Seishuu, which just happens to be Gouenji's old school. Certain members of that team still carry a grudge against him and will stop at nothing to get their revenge. This results into a practice match with the Mukata triplets vs Endou. Unfortunately, Endou doesn't stand a chance against Triangle Z! Will Raimon lose at this rate?
The episode starts with Raimon practicing for their upcoming match. Otonashi states that their next match is against Kidokawa Seishuu that surprised Gouenji a lot. Endou tries to encourage Gouenji by telling both Gouenji and Kidou to come somewhere. Then, the three of them went to Inazuma Town and Endou comes to the candy shop and meets some of the Inazuma KFC members and ask them what candy should he chose. Kidou comments on Endou's personality, that Endou was pure and innocent and Gouenji agrees.
Someone enters the shop and it was the three triplets of Kidokawa Seishuu saying that they are angry at Gouenji for leaving the team, so they ask a match. They did, and Endou tried to use God Hand to try and stop the hissatsu technique; Triangle Z, though is unable to. Endou gets fired up by this and is encouraged to block the hissatsu. Gouenji though, is still worried about their upcoming match against Kidokawa Seishuu.
[Endou Mamoru] Overcome the impossible.