Synopsis

Haruyama Kyoko (played by Nagasawa Masami) is a new teacher at Tachibana First High School, commonly known as Ichiko. While students head home, tension fills the school as entrance examinations approach the next day.

Kyoko, who grew up overseas before returning to Japan for university and working at a travel agency before becoming a teacher, joins other faculty members in checking the school premises and following their complete manual based on past incidents. Though she has a strong sense of justice as a teacher, many school rules remain unfamiliar to her having attended high school abroad.

After all students leave and teachers begin final exam preparations, Kyoko and other faculty members open classroom doors only to be met with alarmed voices:

“What is this!”
“Here too!?”

Every examination room has been plastered with notes declaring “We’ll destroy the entrance exam!”

Who is the culprit trying to sabotage the entrance examinations? And what do they plan to do? Time ticks away as the examination hour approaches…