It's Fine to Fall for You, Right? (Fujiwara no Mokou X Male-reader)

Thirteen hundred years ago, a girl drank a Hourai Elixir. A thousand years ago she went into hiding, away from the spiteful eyes of the public. Seven hundred years ago she unleashed all of her emotions and destroyed everything in her path. Four hundred years ago she was filled with everlasting boredom. But within th...