also: トルーストーリー
noun
A loanword from English, used in Japanese to refer to a story that is based on real events, often in entertainment contexts like movies, books, or TV shows.
この映画はトゥルーストーリーに基づいている。
This movie is based on a true story.
彼の体験はまさにトゥルーストーリーだ。
His experience is truly a true story.
実話 is the native Japanese word for 'true story' and is more common in everyday language. トゥルーストーリー is a loanword often used for stylistic effect or in titles.
Loanword from English 'true story', adopted into Japanese with katakana spelling.