Kamen Rider 12

The movie opens with a pan of nighttime Tokyo. High atop it all, a mysterious man casts out sparkly sand out as he leaps from building to building. This has naturally attracted the attention of Momotaros, who is following his non-existent nose on the trail of an Imagin. He's dragged Urataros, Kintaros and Ryuutaros along with him, although all 3 of them would clearly rather be doing something else (sleeping, taking a bath, etc.) The crew confront the man, who Momotaros finds suspiciously familiar. As well he should: it's Kaitô Daiki, Kamen Rider Diend! Although it takes Momotaros longer to realize this than it does the audience.