If you wondered how the candid camera kunoichi clip or “shaking” video was was made watch this.

Well, they’re hinting at something since they e-mailed us this image of Ryu Hayabusa and Ayane encircled by a purple flame.

Tecmo and Koei, now one under the Koei Tecmo umbrella, are dabbling with crossover content for Ninja Gaiden Sigma 2 and Dynasty Warriors Strikeforce Special.

Tecmo will release a Ninja Gaiden Sigma 2 demo in North America next week, but you don’t have to wait to play it. You can get the demo right now with a Japanese PlayStation Network account.

Tecmo shamelessly demoed their boob shaking feature at a European press event. Back in Japan, Tecmo released a video of a man playing Ninja Gaiden Sigma 2 and bouncing all over the place.

Tecmo Bowl won’t be Tecmo’s only Virtual Console Arcade game. Rygar and Ninja Gaiden are on deck as future releases.

Tecmo will release Ninja Gaiden Sigma 2 in North America a few days before the game debuts in Japan. Ryu and now Ayane, Momiji, and Rachel’s visceral action game slices into stores on September 29.

Pre-order Ninja Gaiden Sigma 2 in Japan and you get a starter set containing a hint book, prologue comic, a visual gallery, and a code to download one of Ryu’s costumes.

In addition to Ryu and Ayane, Rachel from Ninja Gaiden Sigma and Momiji from Ninja Gaiden: Dragon Sword will also be playable in Ninja Gaiden Sigma 2.

Tecmo confirmed their not-so-secret announcement is Ninja Gaiden Sigma 2. The publisher plans to release the game in two territories this fall: Japan and North America. Even though Tecmo doesn’t have a European branch Ninja Gaiden Sigma 2 will arrive…