Kamen Rider Den-O Episode 21

As Ryotaro saw the actual Yuto Sakurai in the past, he becomes suspicious of the one that is Zeronos. After telling the Owner of the battle in 2006, he states that he believes that Yuto may be the Sakurai Ryotaro knows, from 10 years in the past. When Kintaros gives Ryutaros the idea to show his strength to impress Airi, he possesses Ryotaro, who had been in the Milk Dipper with Hana, at the time. Once Yuto leaves, Ryutaros takes control and follows, cornering him with his dancers.