Nayu Komaki

A third girl who appears in chapter 11 as a name on the pendant, and in chapter 15 in person. She calls Yousuke Onii-chan, but she says she is not his sister and they went to the same orphange, where everyone else called him onii-chan. In chapter 15, she kissed him. At the end of the chapter she plans to go to the same school as him so she can be with him. She got into the school and now has a "possessed" cat which can speak. She is rather bold and is always flirting with Yousuke (for which Ayu hits him). She has confessed her love to Yousuke, only to have her heart broken after he said Mayu while kissing Nayu. It was never stated what happened to her after that chapter. (Source: Wikipedia)