Keiwa Sakurai's interactions with the Jyamato are pivotal. He first battles the Saboten Knight Jyamato, a formidable foe. Witnessing a Jyamato transform into Takeshi, he believes Takeshi was turned into a Jyamato, sparking his desire to revive Takeshi. These experiences with the Jyamato lead to Keiwa discovering the truth about his parents' demise and his transformation into Ninja Form.