TV-Series
Description
The character known as Hell is a high-ranking executive of the secret organization SPES. Her true identity is that of an alternate personality belonging to Nagisa Natsunagi, a girl who later becomes involved with the protagonist Kimihiko Kimizuka. This secondary personality was born during Nagisa's childhood as a psychological defense mechanism to protect her from the traumatic experiences she endured within the facilities of SPES. After this personality took over, she became known as Hel and rose to a leadership position within the same organization that had once imprisoned her.

In terms of appearance, Hel stands in contrast to Nagisa. She is depicted as a young woman with short black hair and red eyes, often dressed in a military-style uniform and carrying a sword. As a protective persona, her primary motivation is to shield the original personality, Nagisa Natsunagi, from harm, specifically from the entity known as Seed. Hel holds a significant position within SPES, where she is entrusted with the care of a powerful demonic beast named Betelgeuse. She demonstrates her formidable power and ruthless nature by swiftly decapitating a fellow SPES member named Cerberus and subsequently absorbing his abilities.

Her role in the story is primarily that of an antagonist. She appears before Kimihiko and the legendary detective Siesta, confronting them in a direct battle. During a fight in London, she engages Siesta, resulting in a brutal conflict that leads to Siesta sacrificing herself to protect her assistant. Following this confrontation, Hell sustained severe damage. As a result, she lost consciousness and, in a vulnerable state, her form involuntarily shifted into that of another person she remembered, a girl named Alicia, further complicating her fragmented identity. The alternate personalities of Hell, Nagisa, and the amnesiac Alicia are deeply intertwined, with the history of one affecting the others.

Her key relationship is naturally with her original self, Nagisa Natsunagi. For a time, she lived as the dominant personality while Nagisa slumbered within. However, starting from the third volume of the original light novel, Hel begins a process of reconciliation with her main personality, eventually cooperating with Nagisa. She also has a direct adversarial relationship with Siesta, being directly responsible for the battle that led to Siesta's death. Her connection to Kimihiko is also antagonistic, as he was Siesta's assistant and becomes the partner of Nagisa, the body she shares.

In terms of notable abilities, Hell possesses several supernatural powers. Her primary ability is suspected to be a form of mind control, allowing her to manipulate anyone who meets her gaze. She is also a highly skilled combatant, proficient with a sword and strong enough to kill powerful artificial humans like Cerberus in a single stroke. Furthermore, she can take control of and command the beast Betelgeuse in battle. Her ability set is further expanded when she absorbs the mimicry and enhanced olfactory powers of the artificial human Cerberus after killing him, allowing her to change her form and track individuals by scent.
Cast