Masked Rider the First

College student Takeshi Hongo is abducted into terrorist organisation Shocker (Sacred Hegemony Of Cycle Kindred Evolutional Realm), at the hands of a cyborg Inhumanoid or a Kaijin known as the Bat. There, he undergoes painful reconstructive surgery, turning him into an Inhumanoid himself. He does not escape prior to mental condition by Shocker, and becomes one of their soldiers, nicknamed "Hopper". He carries out a mission successfully, and meets Shocker's Major Agents, including Dr. Shinigami. Hongo receives his orders— Kill those who have seen Shocker's Inhumanoid soldiers. However, what he doesn't realise is that the two witnesses are the journalist who had interviewed him prior to his kidnapping, Asuka Midorikawa and her fiancé Katsuhiko Yano. Attacking the two along with Shocker soldier Spider, it is here that Hongo remembers his humanity, and has an epiphany with regards to what he should do. Despite his efforts, Katsuhiko is killed by Spider, and Asuka finds Hongo next to the body. Blaming him for Katsuhiko's death, she begins to follow him, attempting to ascertain why who she thought was a normal college student is a murderer.

Meanwhile, at Shocker headquarters, it is revealed that those who undergo Shocker's treatment need periodic blood transfusions, lest they reject their cybernetic components. Though Hongo seems to lack the need for the transfusions, he is labeled a "traitor" by Shocker and must be destroyed. It is here that Dr. Shinigami reveals his plan to create a second soldier based on Hopper's design to do the job. Hongo, having now abandoned Shocker, visits Tōbei Tachibana, who gives him his motorcycle, the Cyclone. He is then able to defeat Spider. Asuka meets Hayato Ichimonji, who is identical to her fiancé, who she thought was dead. He reveals that "Katsuhiko Yano" was an alias. What he doesn't tell Asuka is that he has been kidnapped by Shocker and turned into the 2nd Hopper. His mission: defeat Hongo at any cost.

The film also features a subplot, interspersed throughout. It involves two terminally ill hospital patients, who get a chance to live after an offer by Shocker. The couple is taken to Shocker's island base, where they laugh and play under the watchful eye of Shocker's sinister bird logo. It is only then that it is revealed that this part of the film has been a flashback, taking place around a year ago. The two had undergone the reconfiguration and surfaced in the current story as Shocker soldiers Cobra and Snake, who branded Ichimonji a traitor for failing Shocker by putting his feelings for Asuka first.

Ultimately, the Riders team up after Bat attempts to kidnap Asuka and turn her into an Inhumanoid, which enrages Ichimonji enough to cause him to turn on his former masters. They defeat Shocker's three cyborg soldiers at their island base, but Shinigami and other Major Agents have survived, and they're already in the fashioning of a new base of operations while plotting a new scheme to eliminate Riders, once and for all.

in my opinion this film is great