The Executioner and Her Way of Life

The Abyss-a gaping chasm stretching down into the depths of the earth, filled with mysterious creatures and relics from a time long past. How did it come to be? What lies at the bottom? Countless brave individuals, known as Divers, have sought to solve these mysteries of the Abyss, fearlessly descending into its darkest realms. The best and bravest of the Divers, the White Whistles, are hailed as legends by those who remain on the surface. Riko, daughter of the missing White Whistle Lyza the Annihilator, aspires to become like her mother and explore the furthest reaches of the Abyss. However, just a novice Red Whistle herself, she is only permitted to roam its most upper layer. Even so, Riko has a chance encounter with a mysterious robot with the appearance of an ordinary young boy. She comes to name him Reg, and he has no recollection of the events preceding his discovery. Certain that the technology to create Reg must come from deep within the Abyss, the two decide to venture forth into the chasm to recover his memories and see the bottom of the great pit with their own eyes. However, they know not of the harsh reality that is the true existence of the Abyss.

Ko, a human boy, falls in love with Nanakusa, a vampire girl, and wants to become a vampire too, but Nanakusa invites him to her abandoned building just to taste the sweet blood from her neck.

Every day Hane Sakura makes the arduous trip to school, cycling up a large hill on her bicycle. After encountering the motorcycle enthusiast Onsa Amano one morning, she is introduced to the motorcycle club, led by the ever-silent Raimu Kawasaki. New to motorcycles, Sakura experiences firsthand the difficulty of learning to ride again. However, through this, she hopes to once again recreate her first biking experience, which was filled with both horror and exhilaration. Alongside Baita, the talking motorcycle; Rin Suzunoki, a Suzuki model enthusiast; Hijiri Minowa, a wealthy girl who dreams of being a thug; and professional racer Chisame Nakano, Sakura strives toward getting her bike license and experiencing the joys and hardships of motorcycles.

Count D, a quite interesting pet shop owner from an area called Chinatown, sells rare and hard to come by pets to people longing for something special, but with each sale comes a contract. If the rules of the contract are followed, everything goes fine, but if someone should break the rules of the contract, the pet shop cannot be held responsible for anything unfortunate that might happen. Leon Orcot, a homicide detective, has linked many odd and unexplainable deaths together; they all were customers of Count D's pet shop, and he intends to find out why.

Mitsuyoshi Tada, a boy who has never known love, is taking pictures of the cherry blossoms in full bloom when he meets Teresa Wagner, a transfer student from Luxembourg. Upon arriving in Japan, she got lost, and separated from her travel companion. Mitsuyoshi helps her and brings her to his grandfather's coffee shop.

A vigilante organization known as "Black Label" task themselves with killing undesirable people.