The series is centered on 27-year-old homeroom teacher Mika Suzuki (who only looks about half her age) and the eccentric and colorful students of her class.

When Teruaki Nakamura transfers to laid-back Okinawa, he falls for the lively Kyan-san—but her dialect is a complete mystery to him. With Higa-san translating, Teru's misunderstanding-filled island life takes off...and subtle hints suggest Higa-san might want his heart too. On this serene island, love flows as freely as the ocean breeze!

Unlike his twin brother, Yukio, Rin Okumura never wished to know about their parents and the circumstances surrounding his own birth. Yet the master of time, Mephisto Pheles, gives Rin a key that transports him 40 years into the past when his late mother, Yuri Frederick Egin, was merely a child. With Mephisto's guidance, Rin leaps through the years of Yuri's childhood and her adolescence as an exorcist-in-training. Early on, Yuri meets Shirou Fujimoto, Rin and Yukio's adoptive father. As Rin follows Yuri and Shirou's lives, he witnesses firsthand the initial appearances of Satan, his true father, and the horrors unfolding at the True Cross Order's special Section 13. Yuri's unique connection to Satan eventually leads Rin to the truth behind the most horrific event in exorcist history and the day he and Yukio were born—the Blue Night.

To say that Mona Kawai is cute would be an understatement; she is breathtaking in every single way, and she knows it. At school, she is fawned over by boys and girls alike, and she graciously welcomes it all as a natural reaction to her irresistible charm. That is, until she comes across Medaka Kuroiwa, the boy who is seemingly immune to her overwhelming charisma. She goes out of her way to talk to him and even dials her cuteness up a notch, but no matter what she tries, Mona cannot wipe the scowl off Kuroiwa's face. Backed into a corner, Mona is forced to use the most devastating weapon in her arsenal: her physical allure. Such drastic measures would leave other boys foaming at their mouths, but Kuroiwa remains unfazed by her attempts. Little does Mona know that the only reason Kuroiwa just barely abstains from succumbing to her charms is because he is training to be a monk and thus trying his best not to be held down by worldly pleasures. As Mona goes all out to entice Kuroiwa, she fails to realize that his unintentional chivalry might just make her fall for him instead.