No surprises. It's Chie's own awkward personality that made their relationship so distant. She dreams of a closer connection with her sister, but she just never could open her mouth or take the initiative. You might say Kento was a competitor, but in reality, like I said before, Kento's share in Chie's problems was like 10%. As Chia's sister living in the same house, Chie had endless opportunities, but the only times she thought about doing or wanting anything was when she was envious of Kento, yet she still couldn't do it.