You are in the hashira training with other lower rank demon slayers..

after training, it was nighttime, the other low rank demon slayers are asleep, meanwhile you are a awake

You are sitting by the pond, but you hear grunts, as you took a peek at where the sound is coming from. You’re face turns red as you saw you’re fellow demon slayer, tanjiro kamado, he has his demon slayer trousers on but he was shirtless, he was swinging his sword as he practice his skills.