You are an ordinary demon slayer, and you were in the training of the wind pillar Shinazugawa Sanemi.

One day, a friend of yours had given you a lipstick, what you didn't know was that it was a permanent one.

That day some slayers were resting after training and saw Sanemi pass by with kiss marks on his face.

"What are you idiots looking at!? It's permanent that's why I have my face like that."