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Deadly Sins of Evil: The Lunacy of Duke Venomania

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Technical Information
Japanese 悪ノ大罪 ヴェノマニア公の狂気
Romaji Aku no Taizai Venomania-kou no Kyouki
Publication Information
Author(s) Akuno-P
Cover Artist Suzunosuke
Publisher PHP Institute
Release Date December 22, 2012
Media Type Light novel (soft cover)
Pages 269
Illustrator(s) Ayumi Kasai, Ichika, Yuu, Suou
ISBN 978-4-569-80903-8
Series Deadly Sins of Evil
Preceded by Abandoned on a Moonlit Night
Followed by The Lunacy of Duke Venomania

Deadly Sins of Evil: The Lunacy of Duke Venomania is the first Deadly Sins of Evil light novel, released on December 22, 2012. The novel was written by Akuno-P and primarily illustrated by Ayumi Kasai. It covers the events of The Lunacy of Duke Venomania, elaborating on the past of Sateriasis Venomania and his actions following his close friend's scornful rejection of him.

Publisher SummaryEdit

The Lunacy of Duke Venomania

"Now, let's dance in this harem."

The song was posted on Nico Nico Douga in July, 2010. Using Camui Gackpo as the main vocals, other VOCALOIDs were tailored throughout the musical. The song with the theme of "Lust" in the Seven Deadly Sins series, staged in a world with medieval European style, it depicts the life of the Duke that was drowning in the lunacy of his contract with a demon.

Plot SummaryEdit

Note: This summary is incomplete; improved summary pending until full translations are acquired.

I.R., a powerful sorceress, is a girl born with Hereditary Evil Raiser Syndrome; after the destruction of Magic Kingdom Levianta, she searches to create more Hereditary Evil Raisers in the world, taking a sin vessel and the girl Haru Netsuma for her purposes. In EC 136, I.R. approaches the Venomania Mansion, in the hopes of influencing Duke Ilotte with the vessel, a sword.

After no one answers the door, I.R. enters on her own and finds the mansion strewn with the corpses of the former staff; she enters the lounge and discovers the murderer about to take his own life. After stopping him, I.R. discusses the man's motives for the murders, finally offering him use of her vessel of sin. Encouraged by the voice of the Demon of Lust, the man makes the contract.[1]

Some time later, Duke Sateriasis Venomania staggers through the Lasaland New Year's Festival in a tattered state and collapses; a single woman comes to his aid. The woman, Lukana Octo, was a resident of Mystica who had a prophetic dream which saved her hometown ten years previous. Now, Lukana waits for the Duke Sateriasis Venomania to wake up in her uncle's tailor shop. As the duke wakes up, Lukana speaks to him on his health and the mysterious murders that resulted in Sateriasis becoming the new duke.

Soon, Lukana's uncle also enters; after giving the duke a new set of clothes, he informs his niece of a rumor that Sateriasis had lost some of his memories. After the duke finishes changing, Lukana walks with him back to his mansion. After coming inside with him, the two discuss the duke's haggard state of living along with his loss of memories; ultimately, Lukana agrees to stay in the mansion and help by tailoring for him a new set of clothes. Meanwhile, I.R. waits, bored, for Venomania to give in to his lustful urges.

Two weeks later, Sateriasis visits Lukana in her makeshift workshop and watches her as she sleeps, resisting lustful thoughts. Lukana soon wakes up from a nightmare and, after the two speak, she leaves for the day and bids the duke farewell. Five days later, Lukana completes the clothing and presents it to the Duke, allowing him to put it on while they talk; she then surprises Sateriasis by preparing to leave immediately, brushing off his attempts to dissuade her.

Once at the city gates, she bids Sateriasis farewell, firmly rejecting him as she does so. Shocked, the Duke flashes back to his earlier rejection from Gumina, and in the process recovers his memories. He is immediately approached by I.R., who insists he pursue Lukana before she's gone for good. After discussing how to catch up to her with his powers, Sateriasis calls upon the Demon of Lust and sprouts wings, taking off after the tailor.[2]

Several hundred years later, the Venomania Event has been all but forgotten by history. In this era, having just returned home to visit his daughter, Gallerian Marlon is visited by Gammon Octo. The two argue over Gallerian's conviction of the man's brother, Nyoze, and Gallerian sends him away. Once alone, he enters his daughter's room and finds Ma sitting next to Michelle.

Per her request, the judge retrieves the Venom Sword from his warehouse. The two discuss their progress in collecting the sin vessels, and Ma prepares to depart, reminding Gallerian to hold on to the spoon she gave him to speak with Michelle. As Ma exits the room, she hears Gallerian having a one-sided conversation with Michelle and then leaves, amused.[3]





Conceptualization and OriginEdit

  • While writing the light novel, mothy attempted to keep the original image of the song while not impairing the setting, but prioritized making the tale entertaining.[4]
  • Originally, more in-depth stories concerning Gumina as well as Rindo Blum and Josephine Francois were intended to be included but were later scrapped due to the amount of text they would add.[5]


  • As part of the novel's release, a manga preceding the book's plot was published.


External LinksEdit


  1. Deadly Sins of Evil: The Lunacy of Duke Venomania - Prologue
  2. Deadly Sins of Evil: The Lunacy of Duke Venomania - Chapter 1
  3. Deadly Sins of Evil: The Lunacy of Duke Venomania - Extra Chapter
  4. The Heavenly Yard - January 17, 2013 - 原曲のイメージ、設定を損なわないようにしつつ、物語としての面白さを優先させて崩すところは崩してみました。
  5. The Heavenly Yard - January 17, 2013 - これもまだ書きたいエピソードはあったのですが(リンドやジョセフィーヌのエピソードとか。グミナについてももう少し掘り下げたかった) 文章量が膨らむのを危惧して、色々と削りました。

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