Tamaki Matsumoto

Haruka lost her mother at a young age. While her mother was still alive, she received a treasured hand mirror from her. After her mother's death, forgot about the mirror, and eventually lost it. One day, she decides to go to a local shrine and pray for the return of her lost mirror. It is there that she accidentally encounters a small masked creature which she secretly follows to the land of forgotten items. (Wikipedia)

Five children save the life of a dog-like alien while at a self-run summer camp. He attempts to reward them by taking them to an alien colony on the Moon. (Anime News Network)

Ryoutaro and the DenLiner gang have set up a detective agency called the DenLiner Police who seek to catch the Imagin who stole a spare Den-O pass from the Owner and find the Imagin who has built a crime syndicate with human criminals.

Set after the series, the DenLiner gang learns that Ryotaro has been possessed by an evil Imagin who intends to destroy the timeline and resurrect the dead. The only hope is the new Den-O, Ryotaro's grandson from the future.

In the 1980s, Ryotaro and the DenLiner gang save a boy when he is attacked by demons that came from the past. The demons want to change history using a supernatural stone which is a keepsake from the boy's mother.

Yuuto finds himself continually drawn to his fiancee, Airi, and when another man contracts with an Imagin to woo her, Ryotaro and the Imgain are pulled into the situation, all while the DenLiner runs out of control through time.

When Ryotaro and Momotaros are injured in a fight with an Imagin, Kotaro, Kamen Rider New Den-O, and his Imagin partner Teddy return to help solve the case of a stolen ticket and the mystery of a young woman's doppelganger.

Ryotaro and the Imagins find themselves in November 2008, when the DenLiner is stolen by Kaitou Daiki, Kamen Rider Diend. As Daiki tracks his past self, he faces off with Time Police officer Reiji Kurosaki, aka Kamen Rider G Den-O.