The episode ends with Hiyori finally regaining her body, left to deal with the aftermath of being the most "interesting" girl in school for all the wrong reasons.
The story begins with Hiyori Iki starting her first day of high school. Eager to make a good impression and have a "normal" school life, her plans are immediately derailed when Yato decides to possess her body. He claims it's for "market research" to see how high schoolers live, but in reality, he just wants to mess around.
While inhabiting Hiyori's body, Yato's eccentric and boisterous personality takes over, causing "Hiyori" to act completely out of character. This leads to several hilarious and embarrassing scenarios: