超ちょう展てん開かい

noun

abrupt plot twist; unexpected story development

Colloquial term, often used in anime/manga/game fandom to describe a sudden, extreme, or nonsensical turn in the story that feels like it came out of nowhere.

• 最さい終しゅう回かいでいきなり宇う宙ちゅう人じんが出でてきて超ちょう展てん開かいすぎる。

  In the final episode, aliens suddenly appeared—what an abrupt plot twist.

• あのアニメは毎まい回かい超ちょう展てん開かいで、先さきが読よめない。

  That anime has an unexpected story development every episode; you can't predict what will happen next.