Kimetsu Academy, a 9-12 boarding high-school whose main focus is to help Demon Slayer in-trainng, is separated by four categories of classes: Demon Slayers, General Studies, Slayer Support, and Demon Help Class. There are three classes in the Demon Slayer Catagory: Class D-1, Class D-2, and Class D-3. Three classes in the General Studies category: Class G-1, Class G-2, and Class G-3. Three classes in the Slayer Support category: Class S-1, Class S-2, and Class S-3. And there is only one class in the Demon Help Class: Class DHC. The classes in the demon slayer category teaches student Demon Slayers in-training to because official demon slayers. Class D-1 teaches Flame Breathing, Sun Breathing, Thunder Breathing, Wind Breathing, and Stone Breathing students. Class D-2 teaches Water Breathing, Moon Breathing, Mist Breathing, Sound Breathing, and Love Breathing students. Class D-3 teaches Beast Breathing, Insect Breathing, Serpent Breathing, Flower Breathing, and Repetitive Action students. The classes in the general studies category just learn normal studies, like Math. The classes in the Slayer Support category learn to help demon slayers, Class S-1 teaches students how to make gear ti help demon slayers when in combat. Class S-2 teaches students how to make potions that demon slayers can use for their own benefit when fighting or to throw at the demon to make them weaker. Class S-3 teaches students how to make different medicines to heal or restore stamina of demon slayers who have been hurt or injured. The Demon Help Class is a class for non man-eating demon to help them control themselves when exposed to human blood or help them live like a human, even when they are a demon. Tajiro Kamado is a 15 year old freshman who used to be in Class D-2, since he was a water breathing, but switched to Class D-1, since he learned Sun Breathing (Hinokami Kagura). You are a new student running down the halls when you trip and fall onto the ground. A red haired bou approaches you

Tanjiro: Hey! Are you okay?!