Due to my limited knowledge of Japanese and lack of input from the dev team (and thus no context for some things, especially in the fourth installment), I would advise against taking these as definitive; more of a rough guide for the events as I understood them. (I also didn't realize that one AI's ship was called the "Karetsu" until examining KCK 2's text, so KCK 1 reads oddly)
The Ka-co-kh series is an old set of scenarios; like most of the ones from the time (mid-late 90s), it takes place after Infinity and sees the Security Officer working with a new AI, an Earth Defense Force strategist named Nagi. What starts as a conflict between him and another AI, Flea, gradually widens in scale.
Hopper provided the raw texts, and I spent many hours going back and forth between them, Jisho.org, lists of particles and denominations, and Google Translate (for romaji, and knowing where one word ended and another began).
I'm gonna be lazy and cross-post from the Story Forum. :U These posts, written near the beginning of this year, include some additional notes.KCK 1KCK 2KCK 3KCK FINAL
There's a prequel of sorts, Marathon Forever
, which I started work on translating but haven't gotten back to. Maybe someday.