The story of Hantsuki focuses on the budding relationship between the seventeen years old Yūichi Ezaki and Rika Akiba. Both are hospitalized in Yūichi's home town for their respective conditions. Yūichi has hepatitis A, while Rika has problems with a weak heart valve. These teens would then fall in love while they spend time with one another. The story is based in Ise, Mie prefecture as implied by the "Welcome to Ise" sign shown after the opening sequence in the first episode of the anime series.

Ichijuki’s detective agency. A single shield put up at a shabby building. There, the silver-haired girl Ichikuji and the man in black Ninomae made themselves at home. Bound to a contract, a single wish if you will, they’re hunting souls. They are demons, waiting for the next human to come knocking on the rusty door of their agency.

The Disgaea novel series is an expanded universe of the Disgaea game series. It starts with an adaptation of the first game and continues with its own thing, and adaptations of the sequels were added to the universe as the games got released. There are currently 17 novels in the series: Disgaea: Enter the Maoh - adaption of the 1st game. Disgaea: Revelations - beginning of expanded universe content; introduces Laharl’s aunt, uncle & cousins. Disgaea: Returned - Lamington invites Laharl to Celestia. The novel introduces Flonnes parents and her sister. Jennifer’s villainous father returns. An online translation can be found here. Disgaea: On Love (Part 1) - Laharl & Flonne get stuck time traveling and meets his mother in the past. Meanwhile, forces in the Netherworld conspire against Laharl. Disgaea: On Love (Part 2) - the conclusion of the On Love storyline. Disgaea: Battle of the Maohs - crossover with Makai Kingdom. Disgaea 2: Mask of the Maoh (Part 1) - first part of the adaption of the 2nd game. Disgaea 2: Mask of the Maoh (Part 2) - second part of the adaption of the 2nd game. Disgaea: Heart of the Maoh - Laharl gets turned into a baby; Etna & Flonne travel through time to find a cure. Disgaea: School of the Maoh - a parody of High school themed anime with characters from Disgaea, Disgaea 2 and Makai Kingdom. Disgaea 3: Brave and the Maoh (Part 1) - first part of the adaption of the 3rd game. Disgaea 3: Brave and the Maoh (Part 2) - second part of the adaption of the 3rd game. Disgaea: Three Dash! - short stories with Disgaea, Disgaea 3 and Makai Kingdom characters. Disgaea: War of Prinny - a loose adaption of Prinny: CIBTH. Disgaea 4: Power of Iwashi - adaption of the 4th game. Disgaea: Maoh of the Dead - the Disgaea trio makes a zombie movie. Disgaea D2: Revisit - adaption of the direct sequel to Disgaea Hour Of Darkness..