The series follow the story of a high school boy who lives in Tokyo, and his childhood friend, Hakatano Donko-chan, who is from Hakata and really talks in Hakata dialect! People around her sometimes get confused because of it, but her dialect makes them smile!
A high school class is learning about LGBTQ, but the students grow suspicious when they realize that no other classes have such lessons. Is there a queer student in the class?
Ten years have passed since Tsukushi Makino and Domyoji's F4 graduated from Eitoku Academy - a once prestigious school which is now suffering a decline in funding and student enrollment. Oto attends Eitoku Academy but is secretly just a"commoner" who is struggling financially due to the bankruptcy of her father's company. She is afraid her secret will be disclosed if she becomes the target of "commoner hunting" which Kaguragi's C5 is doing to maintain the school's dignity. Meanwhile, Momonozono Academy where Tenma Hase serves as student council president is quickly catching up to Eitoku Academy as a result of Tenma's achievements. Tenma and Oto are in fact engaged to one another and are to be married, but only on the condition that Oto attends Eitoku Academy until she turns 18.