Everyone is saying that the little sister is best girl but I actually find her extremely annoying, why is she best girl? Just because she is a little sister and it's forbidden? What cool stuff has she done? All she does is act like a selfish brat, talk shit to his brother and hit him, what has she done aside from just whining and being a pain in the ass? Nothing, really, just adding poor-written useless drama, also I hate how every single pussy has to be in love with the MC, why not having a healthy sister-brother relationship? Even if they're not related by blood, that doesn't erase the fact that he's being her brother ever since she had memory. Anyways, for me best girl is Erika, she's funny and a little dorky, mischievous but she's a super good girl, not perfect or anything like Segawa, who is just too perfect, and it feels like she's kinda toying with the MC's feelings and by the way she reacted to him failing, it seems like she expects nothing but perfection from him, so I really don't like her that much.