Madoka's husband is away on a business trip. She lives with her two sons, Taichi and Yoichi. While her eldest son, Taichi, is a responsible man, her second son, Yoichi, has yet to decide on a career path, and Madoka is worried about him. One day, Madoka can't stand seeing Yoichi constantly fiddling with his smartphone, ignoring what others say, so she confiscates it. That night, Yoichi sneaks into Madoka's bedroom to get his phone back. There, he finds something completely different from what it was during the day...