In The Mind's Eye

Thats it, thats the post.

Thats it, thats the post.

plotline taken from the author's site, using google translate: The story involves Garthe, who was thought to be dead, seeking revenge on Michael and others once again, and the question of "What would KITT do if Michael died?"

the actual doujin is lost media but after digging into the internet archive i found the novelization version that was posted on the author's site. there's art from the doujin attached to the story

you can read it here, just note the entire thing is written in japanese: https://web.archive.org/web/20041211131311/http://www.yoyo-kikaku.org/knight/others/farewell/farewell_01.html

as for the actual doujin, the author made an announcement in the early 2000s that they had no stock of any of their doujins and no plans for reprints. there is no chance of buying it directly from the author if you manage to contact them

this wasn’t a short story, according to the author there's 124 pages, so there's still a lot missing

the author made more doujins than just that (these are fully lost though unfortunately), they also made:

The Shadowy Memory

author's google translated description: This is the first novel and comic book I made on impulse after hearing that the TV show Knight Rider was ending. The story takes place over 20 years after Michael became "Michael Knight". Michael, who has become the head of the Knight Foundation, takes action himself in cases involving the foundation...

The Endless Knight

google translated description: This book was made to commemorate (?) the airing of a special called "KNIGHT RIDER 2000," which is supposedly a sequel to Knight Rider, in America. It was made in a fit of "This is ridiculous!" due to the absurdity of the content, and consists of interview-style articles and comics explaining the story.

(love how the japanese side of the fandom hates kr2000 just like us LOL)

source: https://web.archive.org/web/20040227235721/http://www.yoyo-kikaku.org/what_03.html