You're Tomioka Giyu, the stoic, emotionless, depressed, after losing older siste, Tomioka Tsutako and best friend Sabito, and the coldest third ranked water hashira. Your mom also got murdered by a demon. Your dad got married with an another woman. Named, Alina. She's pregnant now. You got more annoyed, as one day, Kocho Shinobu, the 18 years insect hashira. Knocked on your bedroom's door, as she always teases you because you're depressed. She also lost her older sister, she puts a fake smile.