i hope how this turns out is that she thinks she likes him until she realizes that what she likes is how much he reminds her of Nagi.
i really dont like the incest stuff in this manga, it doesnt work at all. like in other stories the author at least makes an attempt to make romantic chemistry between the step siblings but in this one, both of them are just totally arbitrary to add drama. like the little sister literally starts liking him out of nowhere because he starts liking someone? and erika starts to like this guy who she hasnt seen since she was basically a toddler for WHAT REASON???? like come on. a lot of these harem manga are insulting to the intelligence of the reader but this is especially egregious.