Mikkai: Amuro to Lalah

密会~アムロとララァ
Mobile Suit Gundam: Secret Rendezvous
Secret Rendezvous: Amuro and Lalah (Novel)
密会 アムロとララァ (Novel)

Sequel

novel
1979
Publishers:
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)