The 11-year-old Marui triplets could not be any more different. The oldest one, Mitsuba, is sadistic and kind of mature for her age. The middle one, Futaba, is perverted and very athletic and has the strength of a full-grown man. The youngest one, Hitoha, is generally very quiet and gentle but when push comes to shove, she might just be the strongest, the most perverted and the most sadistic out of the three. The three are all in the same class, led by the newly graduated teacher Yabe Satoshi. He usually gets pushed around by the girls and, on occasion, abused but the triplets also try to lead him and the new school nurse, the clumsy Kuriyama Aiko, together. However, Yabe had no intention of dating Aiko and the methods the triplets use to accomplish their goal are highly unorthodox...

The story begins on a rainy night, when a homeless little black cat is brought home by a young girl Luo Xiaobai. She names the cat Luo Xiao Hei. However, Luo Xiao Hei is no ordinary cat: he is a supernatural entity that hosts several small creatures called Heixiu. As Luo Xiao Hei new life soon threatened by the mysterious Diting, who commands three winged wolves.

Waking up from a nap, Kino is relieved to see that a certain tower from afar is still proudly standing. Located in the heart of the Tower Country, the immensely tall tower stretches high into the sky, reaching seemingly infinite heights. The tower looks like something out of a dream, but the breathtaking construction is unmistakably real. Intrigued, the traveling partners Kino and Hermes—the talking motorcycle—journey to the tower to get a closer look at the building. Despite already being unbelievably tall, the tower is still being built by the townspeople to this day. Puzzled by the origins of the tower, Kino and Hermes ask around the town for information, but they fail to obtain any definitive answer. They continue to observe both the tower and the townspeople during their stay, hoping to understand the reasoning behind building a tower that requires so much effort. After all, there is always something to learn... even from the strangest of countries.

Yukino Miyazawa is the female representative for her class and the most popular girl among the freshmen at her high school. Good at both academics and sports on top of being elegant and sociable, she has been an object of admiration all her life. However, in reality, she is an incredibly vain person who toils relentlessly to maintain her good grades, athleticism, and graceful appearance. She wants nothing more than to be the center of attention and praise—which is why she cannot stand Soichiro Arima, the male representative for her class and the only person more perfect than her. Since the first day of high school, she has struggled to steal the spotlight from her new rival but to no avail. At last, on the midterm exams, Yukino gets the top score and beats Soichiro. But, to her surprise, he congratulates her on her achievement, leading her to question her deceptive lifestyle. When Soichiro confesses his love to Yukino, she turns him down and gloats about it at home with only a hint of regret. But the very next day, Soichiro visits Yukino house to bring her a CD and sees her uninhibited self in action; now equipped with the truth, he blackmails her into completing his student council duties. Coerced into spending time with Soichiro, Yukino learns that she is not the only one hiding secrets. [Written by MAL Rewrite]