Tsunami Boost (ツナミブースト, Tsunami Būsuto) is a shoot hissatsu technique.
Tsunami Boost was first shown during Tsunami's first day playing football. In the anime, it was originally used to summon waves to surf on. He imagined the ball as if it was an incoming wave. The first time this move was used in an official match was between Oumihara's friendly against Raimon. While in the match against Big Waves while Tsunami was suppose to use try out his new move it was shown that he used this technique instead and it was shown to be stopped by Great Barrier Reef.
The user first summons a gigantic wave surrounding the field. He then surfs along the wave on the ball. As he jumps above the wave, he pulls off a double somersault to gain velocity and then kicks the ball towards the goal.