Hikaru Minami is a charming airhead whose thoughts often drift to the vast, star-filled night sky. Together with her friends, she is a devoted member of the astronomy club. One night, while watching shooting stars alone, she collides with a tall boy with bleached hair, and at that moment, she hears the tinkling of a bell. Minato Asou is notorious for frequently associating with bikers and gangsters, for his aloof personality, and for a confusing past marred by violence and rumors. However, Hikaru chooses to judge him with her own heart, looking past the clouds of whispers in which he hides—and their unlikely friendship soon blossoms into love. Hikaru brings out Asou's sincere gentleness for the world to see, but she also uncovers a long-kept secret tied to the soft sounds of a bell.