Unlockable Event tech
After you finish the game/route and restart it for new play-through, (a) new event(s) which previously didn't exist is(are) inserted at random points(mostly in common route), They are mainly used -to present the readers with more details about the story with each playthough -as a progressive foreshadowing of the true route which typically require multiple playthroughs to unlock. -simply as a "bonus event". Do not mix this with [url=/g1478]Bonus Side Stories[/url]. Unlike side stories which exist as "bonus content" and need separate access, new events are naturally added to the overall story.
No games carry this tag yet.