Ding-dong! “Hello, is this Akira Hibiya-san’s residence?” One day, as a birthday present, a girl-type smartphone called “Extra” with the latest model and super high performance was sent to me, an introverted guy. Ever since registering it with the thrilling “lip pattern authentication” on my smartphone, we’ve been together all the time because “she’s a smartphone.” When I transferred to a new school, I exchanged IDs with everyone in class through the “trembling dance,” instantly becoming popular and leaving me behind. She won’t show me her messages (she reads them out loud), and the alarm function is useless, but I made new friends, and every day became exciting… A new, classic boy-meets-girl and romantic comedy brought to you by a cute girl smartphone.