So I'm an NPC

[One Female Lead + No CP + Ensemble Cast + Mystery + Supernatural]

I originally wanted to write a story with a strong female lead, but somehow it turned into an ensemble cast. Please bear with me.

Yu Yao often dreams, but every time she wakes up, she forgets what she dreamed about. She also finds herself holding a plush keychain when she wakes.

One night, after working late, she takes the bus back to school and has another dream. She forgets what happened in it, but this time she remembers that, at the very end, a girl gave her a plush keychain.

After that, Yu Yao's dreams gradually become clearer. She discovers that people whose wishes come true disappear from this world, while those around them envy their disappearance. Yu Yao is baffled. It is only in a later instance that she finally learns the answer...