The fourth and final OVA of the Leina-centric Machine Robo: Revenge of Chronos spin-off/sequel. Instead of following the story of the previous Wolf Sword Legend continuity, Lightning Trap takes place in another universe. In present day Tokyo, traveling has never been more comfortable than aboard the Lightning L808, Japan's new luxury passenger plane. One day, on what seemed to be a routine flight, Haruka Leina and the plane's passengers were unaware of the mysterious and top secret cargo brought aboard, which attracted the attention of international terrorists set on obtaining it. Now, with a dangerous hostage situation at hand, only special agent Laika Strange and brave Leina may be able to save the passengers, and keep the deadly cargo from falling into the wrong hands...

Hiroshima, summer of 1945. A young girl named Nobuko saves a starving kitten from crows. She wants to keep the kitten, but her parents dismiss the idea. Nobuko eventually convinces them to let her keep it. She and her brother Makoto name the cat Kuro. Kuro quickly brings joy and laughter to the family. As World War II takes its toll on Japan, it becomes harder for Nobuko and her family to care for Kuro. One August morning, Kuro begins acting strangely...

Yasuda Ippei (Shonozaki Ken) is the son of Yasuda Seijiro (Osugi Ren), the head of Yasuda Group, Japan's biggest business conglomerate. Although he is the son of a distinguished family, he has absolutely no disagreeable areas and is liked by everyone. His academic achievements are exceptional. He completed his entire high school programme in 2 years and qualified for Tokyo University's Faculty of Law without studying for the exams. In order to establish his own concept of justice, Yasuda leaves his position as the heir to the Yasuda Group to attend the police academy. He becomes a detective at Kyobashi Police Precinct and bravely faces great evil.

Featuring a modern-day odd couple, the naive virgin Kubota and the handsome charmer Hachisuka, who meet up by accident in a Middle Eastern desert and return to Japan to hustle their way through life. They start by getting involved in shady TV dealings, where they get jobs making fake docmentaries.