Azumi, a manga artist, is staying at the guesthouse "Sun Plaza Asanuma'' with the cheapest accommodation. However, she can't concentrate on her work because she is bothered by the lively voices of the house mother, Mariko (Kikuchi Momoko), and her daughter, Misaki (Ohara Yuno), coming from the common space. When she looks up the reputation of Sun Plaza Asanuma on the internet, she finds a list of bad reviews, but among them she finds a mysterious comment: "A door opens." Then, when Azumi is stuck at work, a "door" suddenly appears in front of her that leads to the backstage of Hello! Project...