This is such a dumb thing to ask her. Does she actually have nothing bouncing around in her brain because the gyaru lifestyle has taken over like a parasite? You have a lady saying she's your sister even though you don't recognize her. She has directly told you she spent an untold amount of time looking for you and to her you just appeared out of nowhere claiming you're someone else. What do you mean "What's any of that got to do with you?" in response to "What happened to you?"? Then as soon as she leaves you just straight up insult her? Is Oto a straight up heartless idiot or what?