Eri

Because she has a little sister to feed, she has to work as a prostitute. In addition, she has high debts, which means that she cannot leave this place. But Ryuuji Nomoto encouraged her and confesses his love to her, which is why she wants to at least try to lead a decent life. But in reality she is dating another man and just lied to Ryuuji. The story about her sister isn't correct either, because she actually doesn't have a sister. Nevertheless, Ryuuji doesn't really matter to her, which is why she would like to encourage him to continue living.