It's because the sunlight literally kills them.
Caffeine, on top of tireless training, will be your key to victory.However, it is also super convenient that the majority of humans are typically sleeping at night. If you're thinking of joining their ranks you better get used to the night shift. You'll be all revved up and ready to work! Demon Slayer 13oz Tanjiro Glass Mug with Lid Thankfully, we have the nocturnal warriors known as Demon Slayers to take care of those cowardly fiends! Those demons better beware once you fill up your brand new Demon Slayer 13oz Tanjiro Glass Mug with your favorite coffee or tea.