"Rai" is one of the two ultimate techniques that Sanada previously sealed off, in order for him to beat Tezuka one day. Yukimura and Tanegashima of the 1st string were able to return the shot flawlessly so far. This move was first mentioned in Rikkaidai's Semi-Final against Nagoya Seitoku, and gave Sanada the overwhelming 6-0 victory. However, it was first seen in Sanada's battle with Tezuka in the National Finals.