Nao

Nao is a girl with a very tough exterior, acting indifferent toward people and often seeming careless and harsh. She is very observant and good at reading situations and understanding what's really going on, which is how she guesses that Aoi is in love with Chihiro. Deep down, Nao is a very caring and protective person, and when she notices something is wrong she tries to help in her own way. She is also very smart and gets surprisingly good grades. She falls in love with Aoi, which leads to Chihiro revealing her hidden side. Nao and Chihiro become rivals.