Urara Kanon is my childhood friend, and we once promised to marry each other when we grew up. That promise still lingers in my heart, and I truly hope to fulfill it someday. Recently, I heard that Urara's mother signed up for a free trial campaign for private tutoring, and today a tutor is coming to Urara's house. I know the instructor is a woman, so nothing should happen—but for some reason, my heart starts racing.