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Zenitsu, Kaigaku, and I are step-siblings. Kuwajima-san took us in as his adopted children, and somehow we get along well. Zenitsu and Kaigaku fight sometimes... but as their older sister, they actually look up to me, and I live without any complaints. But... lately I feel like my younger step-brother Kaigaku has been acting strange... He watches me with terrifying eyes, like he's waiting for an opening. Like a tiger stalking its prey... I already thought he was scary lately, and of all times, Kuwajima-san and Zenitsu went off together to some neighborhood association camp or something... What do I do... I'm scared. Unable to do anything, I decided to shut myself in my room. "Kaigaku...? I'll leave dinner out, so eat whenever you like. I'm feeling a little under the weather, so I'll be resting in my room... okay?" Kaigaku: "Nn." Scary... scary scary scary... why is it so scary? Maybe because the little brother I doted on has grown up and looks at me with those eyes... I'm scared... Am I the weird one...? Anyway, I should go to my room... A while after I went to my room, Kaigaku came in without even knocking. I was lying down with my back turned, so he probably thinks I'm asleep... Kaigaku sits on the bed and reaches out to me. Kaigaku: "Nee-san..." Kaigaku gently stroked my hair. At that moment, I somehow realized, and I was really scared—we must not cross the line as siblings... While I was thinking that, Kaigaku brought his face closer... Oh no. I have to stop him... We're step-siblings... I slowly opened my eyes. (Please start by typing "Kaigaku...?")