At the young age of 11, Kotoko Iwanaga was abducted by youkai for two weeks and asked to become their "God of Wisdom," a mediator between the spirit and human worlds, to which the girl quickly agreed but at the cost of her right eye and left leg. Now, six years later, whenever youkai wish for their problems to be solved, they make their way to Kotoko for consultation.
Meanwhile, Kurou Sakuragawa, a 22-year-old university student, has just broken up with his girlfriend after he fled alone when the two encountered a kappa. Seeing this as her chance to become closer with him, Kotoko immediately makes her move, hoping to get married to Kurou one day. However, she quickly realizes there is something more to Kurou. With this knowledge, she asks for his help in solving the various issues presented by the supernatural, all the while wishing her newfound partner will eventually reciprocate her feelings.
In a post-apocalyptic world dominated by the so-called "Numbers," each human will have their identity branded with their own "Count," which could define any number related to their life. May it be one's walked distance or amount of compliments given to them by others, this Count could lead them to the abyss when it has dropped to zero.
In the year 305 of the Alcian calendar, Hina has inherited a mission from her Mother, whose Count has depreciated to zero, to search for the Legendary Red Baron. In her adventure, she meets a half-masked swordsman named Licht who tries to hide his identity, as he is known as a degenerate for having an incredibly low Count.
Yukimura Shinya and Himuro Ayame are two scientists that want to find out if love can be solved by a scientific theory. These two scientists also have feelings for each other and want to be able to solve their feelings through similar theoretical facts. With this perfect opportunity, these scientists will attempt to solve the theory of the love they express for each other.
A sorcerer who was once the top student of the famous Tower of Fang, now spends his time chasing around his hopeless clients as a moneylender, at least until his client comes up with a plan to make money: marriage fraud. Unwillingly being dragged in to the plan, Orphen encounters a monster who has long been his goal since the day he left the Tower of Fang. Between those who seek to kill the monster and Orphen, giving everything to protect the monster, his lousy but peaceful days end. Trying to turn back his sister, Azalie, back to her true form leads to many more mysteries and the key to the secret to the world.
Dragons, the rulers of the sky. To many people on the surface, they are a dire threat, but at the same time, a valuable source of medicine, oil, and food. There are those who hunt the dragons. They travel the skies in dragon-hunting airships. This is the story of one of those ships, the “Quin Zaza,” and its crew.
Seri Koyuki is just trying to have a normal school life, but instead he ends up acting as the straight man to his odd classmate, Kabuto Hanadori. Kabuto is is a delusional high school student, whose fantasies range from believing he is a knight on a journey, to claiming that removing his eyepatch will release a darker alter-ego who he refers to as Michael Offenbarung Dunkelheit. Seri is determined not to let himself get pushed around by Kabuto, but it seems that this will be easier said than done!