In an attempt to turn his floundering career around by compiling one hundred ghost stories, struggling author Momosuke Yamaoka roams through Edo-period Japan searching for material. During his travels, the young man wanders deep into the mountains, where he encounters a monk named Mataichi. Failing to heed the monk's advice to turn back, Momosuke presses forward and soon witnesses a murder carried out by Mataichi and his two associates. As it turns out, Mataichi's gang also investigates paranormal incidents—aiming to make those in the wrong pay the ultimate price. Continuing to seek out subject matter for his stories, Momosuke repeatedly crosses paths with the trio of outlaws, becoming increasingly involved in their schemes each time. As the author strays further toward the world of darkness, he grapples with both the morality of the group's actions and the line between humans and the supernatural.

After an airplane crash during a school trip, Oribe Mutsumi and her classmates were stranded on a seemingly deserted island. Mutsumi found the other survivors, and used her wilderness knowledge to help them. She expects that they will be rescued in about three days, which doesn't seem so long to endure. However, she didn't account for the fact that the island is populated with gigantic killer insects. Her knowledge of butterflies, wasps, and more may be the only thing that will help any of her classmates survive to be rescued! (Source: MangaHelpers)

Short episodes with super-deformed characters posted on the official Twitter account. Includes the extra episode commemorating the BD/DVD releases.

Life has returned to some form of normalcy after the end of the series, and so His Majesty Yuuri Shibuya travels to oversee how things are going. While doing so, he runs into the king of Small Shimeron--Sararegi. But it seems there may be something more to him than the friendly king he presents himself as. Yuuri go back to Shimaron to relax and meet some friends, when the king of Little Shimaron suddenly joins the group and wants the Maou to come to his country. The Original king sends a message to Yuuri's brother and his friend that Yuuri is in trouble. (Source: ANN)