In 22nd century Japan, a young scientist and a historian must race against time to fix a malfunctioning time-travel device that threatens to alter history, only to discover that the historian is a time-traveler from the future with malicious plans to manipulate the past.
Protagonist: A young scientist who invents a time-travel device; Deuteragonist: A historian from the 22nd century who helps the protagonist navigate the historical context of Japan.
The protagonist's time-travel device malfunctions, causing a ripple effect in the timeline that threatens to alter the course of history, leading to a race against time to fix the device and set things right before it's too late.
In the end, the protagonist and the historian work together to repair the time-travel device and prevent any further damage to the timeline. They successfully restore the course of history and the protagonist gains a new appreciation for the importance of preserving the past.
Twist: The historian turns out to be a time-traveler from the future who had been secretly manipulating the protagonist's invention to alter history for their own agenda. The protagonist must outsmart the historian and repair the device to stop their malicious plans and preserve the true timeline.