semidocumentary

/S EH0 M IY0 D AA0 K Y AH0 M EH1 N T ER0 IY0/
noun
  1. 1

    A drama (film, book or TV) that presents a fictional story incorporating many factual details or actual events

adjective
  1. 1

    Of such a drama

Source: https://en.wiktionary.org/wiki/semidocumentary