Kamen Rider Den-O (仮面ライダー電王 Kamen Raidā Den'ō?, Masked Rider Den-O) is the seventeenth installment in the popular Kamen Rider Series of tokusatsu programs. It is a joint collaboration between Ishimori Productions and Toei. It premiered January 28, 2007 on TV Asahi, and concluded airing on January 20, 2008. Its lead actor Takeru Satoh is the first Kamen Rider Series lead born in the Heisei period of Japanese history. Along with the usual film adaptation that Heisei Kamen Rider series have released during the late summer of their broadcast run, Den-O had a second film released in the spring following its broadcast run which grossed 730 million yen (approximately US$6.8 million)[1] and a series of ten OVA shorts, both of which are firsts for any Kamen Rider. Continuing the trend, Kamen Rider Den-O also had a third film released in October 2008, the first for any Kamen Rider series[1][2] and a second series of 12 OVA shorts was released in November 2008. Takeru Satoh claims that the reason that Den-O has amassed such popularity is because of its comedic timing.[2] A fourth film was released on May 1, 2009,[3] and three more released in the summer of 2010. The catchphrases for the series are "Traveling through time, here I come!" (時を超えて 俺、参上! Toki o koete ore, sanjō!?) and "The time train, DenLiner! Will its next stop be in the past or the future?" (時の列車デンライナー!次の駅は過去か?未来か? Toki no ressha Denrainā! Tsugi no eki wa kako ka? mirai ka??).

A woman named Kiwako (Hiromi Nagasaku) abducts a baby from a man whom she has had an affair with. For four years Kiwako raises the child as her own until she is arrested. The child named Erina is then returned to her birth parents, but she can't find peace. As an adult, Erina (Mao Inoue) also becomes involved with a married man and becomes pregnant. To confront her past, Erina goes to Shodoshima where she lived with Kiwako as a child. There Erina discovers a shocking truth and is forced to make a decision ...

A film centered on the conflict between fathers who have been cared for all their life due to congenital disorders, but now give up their lives for boys and sons who want to become adults, but can no longer do that. It depicts a human life, dignity and true understanding.

Tamiko (Ayumi Ito) lives happily with her husband Hideaki (Sho Aoyagi) and step-daughter Kotoyo (Hazuki Inoue). Tamiko married her deceased friend Mari's (Mami Nakamura) husband. Tamiko gets along well with her step-daughter Kotoyo, but Kotoyo still doesn't call her mother....

Sergeant Chow’s actions are misconstrued, but in the face of tough challenges, the girls develop a stronger bond and mature together. Lieutenant Roxanne Tan complicates Joey's relationship with her boyfriend. The girls go through gruelling obstacles in their GBMT journey, which eventually lands them in a dangerous situation and their actions will shock the nation.

Based on the webcomic "0.0MHz" by Jang Jak, which follows members of a club who are haunted by ghosts. They venture into a haunted abandoned house, planning to investigate and find a way to stop the paranormal happenings there but encounter something else instead.

On March 26, 1991, the local elections are being held. Since it is a school day off, the five boys set off to the nearby mountain and never return. Their parents try to get the police to investigate right away, but the authorities are more concerned about guarding the election poles. Days later, thousands of police set on the mountain to search for clues as to what may have happened but nothing turns up.

In 1996, a career-driven documentary maker, Kang Ji Seung is transferred to the small town after being disgraced for rigging an award-winning documentary. He then decides to investigate the case in the hopes of making a comeback. He teams up with an equally ambitious professor who hopes to make a name for himself by solving the crime where police failed. The professor’s theory, which seems to have quite a bit of compelling evidence behind it, takes the pair in a direction that the police were reluctant to investigate.

Based on "Frog Boys", a true unsolved murder case from the early 1990s.