She probably thinks that he's only into her because she let him have sex with her. She's probably planning to go to onsen and all that to see if he will get seduced easily and attempt to have sex with her. I mean, I don't hate Kirara or Satsuki, but I really like Ragi-nee. I hope Haruki don't end up with Kirara since it's unfair for the two girls who basically knew Haruki for so long and Kirara only knew Haruki a day before the apocalypse. 😂