The final installment of the Leina-centered spin-off/sequel, Machine Robo: Revenge of Chronos, is the fourth OVA. Unlike its predecessor, Wolf Sword Legend, the events of Lightning Trap play out in an alternative universe. Tokyo's modern-day transport luxury is the Lightning L808 passenger plane, which offers passengers a comfortable experience. During a routine flight, Haruka Leina and her fellow travelers are oblivious to the aircraft's mysterious and highly classified cargo, which grabs the attention of international terrorists who seek to acquire it. With a life-threatening hostage situation now on their hands, only the valiant efforts of special agent Laika Strange and fearless Leina can save the passengers and prevent the perilous cargo from falling into the wrong hands...