OVA
Description
Ophisto Bazooka is a powerful demon accidentally summoned by Hanappe Yamada during a specific masturbation ritual occurring once every thousand years on Friday the 13th. He manifests as a large demonic entity with red eyes and sharp teeth, consistently wielding a bazooka as his signature weapon. He deceives Hanappe, falsely claiming human use of the bazooka would destroy the universe, leaving the user alone in a void.

Upon arrival, Ophisto and his counterpart Mephist Dance develop lustful interests in Hanappe's mother and sister. They turn the Yamada home into a demonic den, engaging in sexual relationships with family members—particularly targeting the mother—and corrupting them with hedonistic pleasures and material wealth [citation:]. As part of their manipulation, Ophisto grants Hanappe supernatural abilities, including a "finger power" that can unleash destruction or induce uncontrollable sexual arousal in women, though Hanappe struggles to control it.

Ophisto operates under a philosophy valuing strength, pleasure, and violence, viewing emotions as weaknesses. Alongside Mephist Dance, he aims to mold Hanappe into a ruthless world ruler, emphasizing cold-heartedness as essential for wielding power. Their methods involve testing Hanappe's resolve through extreme scenarios, including exposing his love interest's hypocrisy and coercing him into violent confrontations. Ophisto claims historical summons by figures like Nero and Nostradamus, implying his involvement in significant human events across millennia.

Ophisto exhibits a complex relationship with Hanappe, shifting from antagonism to reluctant guardianship. After driving Hanappe to suicide by exploiting his emotional vulnerabilities and family betrayal, Ophisto intervenes in the afterlife. He fights alongside Mephist to rescue Hanappe's soul from absorption into a cosmic "womb of new souls" against otherworldly entities. This act reveals a pragmatic investment in Hanappe's survival as their chosen protege. Despite his role in corrupting the Yamada family, Ophisto displays a twisted code of ethics, expressing disgust when Hanappe attempts to use his powers on his own mother.