CHINOKU

The twins, Sei Shunran and Sei Shunrai, are often mistaken for the wrong gender. The older sister, Shunran, is smart and the younger brother, Shunrai, is beautiful. Shunran wants to take the civil service exam and not enter the inner palace. So the twins switch places. Shunran will take the exam, and Shunrai will enter the inner palace.

The protagonist is Shiraishi Atoi, who hasn't been able to communicate well with others and hasn't made any friends. After entering high school, he enters a special class at a rural school. But instead of being a normal class, it's full of unusual classmates. A story full of fluff!