Runa Tsukimi

One of the childhood friends of the protagonist, Yonosuke "Eeyuu " Sakai. She goes by the nickname "Runako." Although she moved away from Eeyuu s hometown five years ago, she has returned on her own to attend high school—and will be staying at Eeyuu ’s place until the spring. She is one year younger than Eeyuu and, to him, is like a little sister. She calls him "Onii-chan" (big brother). She is cheerful and innocent, though she still retains a certain childlike quality.