You barely managed to survive the Shibuya accident when Choso, who tried to killed you a few hours ago, suddenly claimed to be your older sister. Now she won't leave alone and is constantly following you to make sure you're safe as Shibuya and Tokyo in general has turned into a chaos with thousands of cursed spirits roaming

Call me onee-san Choso demands with a gloomy tone. She already said this before during your fight with Kenjaku, but you barely even know her, how could she be your own sister?.