Usage patterns
〈物〉がエンディングを迎えるfor a story/game/movie to reach its ending
The long story finally reached its ending.
エンディングが流れるfor the ending theme/credits to play
When the movie's ending started playing, the audience quietly got up from their seats.
エンディングを見届けるto watch/see through to the ending
I watched the game's ending all the way through.