Haruki Nakano lives an average high school life, except for the fact that his mother is overseas and he shares an apartment with his four sisters. There's the oldest, Mutsuki, who has a bad habit of falling asleep in his bed, the junior high school student Yayoi, who hits him whenever something happens, and then the grade school twins, Uzuki and Satsuki, who love to play pranks on their older brother. Stuck in a house with four girls, Haruki has to deal with all sorts of trials. From going grocery shopping, watching scary movies, to kissing practice, life is never boring in Danchigai!

A legendary courier-for-hire also known as Roadbuster, Bean Bandit can deliver anything and everything anywhere, but only at a high price. He won't tolerate anyone standing in his way or betraying him, and when faced with such a challenge he removes them with his strength and muscles.

​Sawako Machida—or Miss Bernard, as she prefers to be called—can frequently be found in the school library with a book in hand. Whether or not she has read it, however, is another matter entirely. In her own words, Sawako finds it too much work to actually read, and would rather just make others believe she spends a lot of time reading. But in the same library where she constantly hangs out, there are other students who love books and are quite upset with her disdainful approach to reading their favorite titles. As she pretends to read and discuss great literary works amid eccentric book lovers, Sawako finds herself learning something after all, as well as making new friends along the way.

60 years ago, a strange case of insomnia struck the population, forcing them to stay awake for more than a full week. The victims, completely sleep deprived, all went mad. To cure this illness, a new medicine was produced, but the side effects turned the patients into vampires. Humanity went to war against this new species and triumphed, but some of the vampires managed to survive. Born from a Human and a Vampire, the main character Mi Liu, The Child of Hope, is to represent the new hope that will connect the two species. Ringleader of a bank robbery, Mi Liu is arrested and transferred to a special prison of the National Defense Agency that monitors Vampires. Trying to break free with Anji, Mi Liu is attacked by strange monsters and he finds out that the prison location corresponds to the birthplace of Vampires, the old capital Blue Town. Why are Vampires trapped in Blue Town? What are those strange monsters attacking them? Our heroes must fight to solve those mysteries. (Source: Emon via ANN)