On the September 5 episode of "Raw", Tozawa was announced as part of WWE's upcoming cruiserweight division. On November 2, Tozawa was announced as a roster member for the upcoming cruiserweight-centric "205 Live" show. On February 6, 2017, Tozawa made his debut on "Raw", defeating Drew Gulak. In June, Tozawa was recruited by Titus O'Neil to the "Titus Worldwide" stable and entered in a feud with the Cruiserweight Champion Neville. At Great Balls of Fire event, Tozawa was unsuccessful in his first championship opportunity against Neville; however, he pinned Neville in a tag team match the next night. On the August 14 episode of "Raw", Tozawa defeated Neville to win the Cruiserweight Championship. However, at SummerSlam, he dropped the title to Neville, ending the reign at 6 days. In late 2017, Tozawa quietly left Titus Worldwide.