My childhood friend and lover, Kana. She no longer has any interest in me. Even though she is very friendly and cheerful to her other friends in class, but when I talk to her, she only responds me with a single word, ‘Hmm.’ While I feel I’m just being used by Kana as a convenient partner, Setsuna, my senior who is the student council president, urges me to break up with Kana. I refuse her offer at first, but Setsuna tells me that I should make Kana feel threatened of losing me by going out with her.