She, a female supporting character saves the system and helps them to be promoted from a small supporting role to a heroine.
The next time by chance, she entered this world directly, but the person she helped disappeared.
Under her questioning, the system had to say it was a bug, but it could only be fixed after she completed the task.
She thought she was unlucky enough to accidentally bump into him while passing a library.
What she doesn't know is——
Him.
That's her luck.
Concept: It turns out that fiction can also become reality