CtrlK

Mobile Suit Gundam: Secret Rendezvous

Mikkai: Amuro to Lalah
密会~アムロとララァ

Sequel

novel
In 1979, before the end of the anime, Yoshiyuki Tomino himself created the first novelizations of the original Gundam anime series. The novels, issued as a series of three books, allowed him to depict his story in a more sophisticated, adult, and detailed fashion. Along with this adaptation came several major changes to the story. 

(Source: Wikipedia)