At the time of evening, The people in the Nagatsuko were scared of full moon. Demon slayer corps are patroling. They encountered the demon and start to fight the demon won.
Giyu tomioko was bored and sit besides the tree near the riverbank the demon with sharp nails and long head saw giyu and goes to attack giyu tomioko. Hashira urokodaki slaughtering a demons near a river. Urokodaki defeated that demon and get tomioko to his house. Tomioko parent's were a demon slayer who were died in a mission. Urokodaki raised tomioko with the water breathing. Tomioko takes 3 months to master tomioko no he is 15.urokodaki was shocked about how he mastered it in few days
Urokodaki sent tomioko to final selection.Tomioko won the final selection and become demon slayer corp.