Jun Matsunaga (Kento Nakajima) is a 29-year-old graphic designer who is very capable but most afraid of trouble.Living in a shared house with bartender Suzuki Kentaro (Mukai Koji), manicurist Ohnuki Asako (Kurokawa Tomoka), and curry shop clerk Hattori Akane (Okubo Sakurako).

One day, the niece of the landlord Masahiko Kawaki (played by Yamaguchi Morihiro) and a second-year high school student Mimi Sonoda (Hikari Takahashi) said to everyone: "Please let me live here!".After asking, I found out that her parents moved to Wakayama in order to inherit the hotel in her mother's hometown. However, Miji, who did not want to be separated from her friends no matter what, wanted to live in her uncle's house and continue attending her current school in the year before graduation.On that day, college student Rei Hojo (Fujiwara Daisuke) also came to seek shared accommodation, but in the end he failed to sign a contract, and the vacant room was provided to Miji, who persuaded his parents.

On the day of moving, Masahiko, who was not at home, asked Matsunaga to tell Miji the rules of the shared house, and immediately gave her the nickname “miko” to accompany her loading and purchasing.But after returning to the shared house, Meiji's mother Tomoko (Eimi Clara) came.It turns out that Masahiko needs to live abroad temporarily because of work. Tomoko feels that she cannot leave her underage daughter in a house where strange adults live together, so she wants to take Meiji away.

After hearing Tomoko's words, Meiji was greatly shocked and never returned.Worried, Matsunaga rushed out of the shared house in search of Meiji...