Shuuzou Shuu Matsutani lives his ordinary life in peace. He has friends, a crush, and a passion for kendo. Dejected after losing to his kendo rival, Shuu climbs a smokestack to watch the sunset where he finds Lala-Ru, a quiet, blue-haired girl wearing a strange pendant. Shuu attempts to befriend her, despite her uninterested, bland responses. However, his hopes are crushed when a woman, accompanied by two serpentine machines, appear out of thin air with one goal in mind: capture Lala-Ru. Shuu, bull-headed as he is, tries to save his new friend from her kidnappers and is transported to a desert world, unlike anything he has ever seen before. Yet, despite the circumstances, Shuu only thinks of saving Lala-Ru, until he is thoroughly beaten up by some soldiers. As he soon finds out, Lala-Ru can manipulate water and her pendant is the source from which she is able to bring forth the liquid, a scarce commodity in his new environment. But now, the pendant is lost, and Shuu is the prime suspect. Ima, Soko ni Iru Boku is the haunting story of a dystopian world, and of Shuu, who has to endure torture, hunger, and the horrors of war in order to save the lonely girl he found sitting atop a smokestack.

During the height of World War II, Nazi Germany seeks to strengthen their soldiers with technology crafted under the influence of vampiric biology. Out of fear of this technology turning the tide of war in the Axis's favor, Sir Arthur Hellsing enlists his butler and soldier Walter C. Dornez and vampire Alucard to put a stop to the German plot, sending the two men into a conflict that will scar them both forever.

En route to conquer a Great Labyrinth with his allies and former classmates, Hajime Nagumo is sidetracked by a tragedy that befalls his party member Shea Haulia. After encountering a group of rabbitmen caught in an ambush, Nagumo learns that members of Shea's Haulia Tribe have been abducted by soldiers of the Hoelscher Empire. To alleviate the anxiety of Shea, whose father may be in mortal danger, Nagumo decides to head toward the empire and rescue the missing Haulias. After arriving at his destination, Hajime is caught up in political turmoil between the empire and the Heiligh Kingdom. As princess Liliana S. B. Heiligh tries to formalize an alliance with the empire to protect her weakened kingdom against demon attacks, the Haulia Tribe plans to assassinate Emperor Gahard D. Hoelscher to free all rabbitmen from the empire's threat. Determined to protect his allies at any cost, Hajime will need to ignore all political considerations and unleash his unstoppable power on anyone who may stand in his way.

Following the events of Jigoku Shoujo Futakomori, Ai Enma, the Hell Girl, has disappeared. Her former companions decide to lead normal lives, until their absent mistress returns to them with a new companion, and in a way that none of them anticipated. Yuzuki Mikage is a normal schoolgirl who soon comes to understand the Hell Girl on an intimate level. During a dream-like trance in the bathtub, Ai kisses Yuzuki and possesses her. So when Yuzuki's friend decides to type in the name of their teacher in the Hell Correspondence website, Ai makes use of Yuzuki's body to accomplish her own task of ferrying the teacher's soul to hell. Yuzuki is disturbed by her new circumstances and wonders why she was chosen to continue Ai's work. Unfortunately for her, the Hell Girl and her assistants resume operation of Hell Correspondence, and she is dragged along for the ride towards hell itself.