In the hazy embrace of a theater, the enigmatic band Sigil Angel demands to be heard. Their allure is undeniable; every member is captivating, even the two demons among them.

As they strive for stardom, their debut album struggles to crack the top 100, despite fervent persuasion. Unbeknownst to their adoring fans, the band's riches are siphoned by their conniving manager, Trystan Hale.

In a bold move to settle the score, drummer Alvise Bellucci, enlists the help of Hale's daughter, Misty. Simultaneously, they are advised that a female lead singer could be the key to their elusive success.

Enter Celestia Monet, a gothic beauty with the voice of an angel, who captivates lead vocalist Ezio. Seizing an opportunity, Alvise proposes a high-stakes bet: should Ezio win Celestia's affections, his long-desired liaison with Alvise will be granted.

However, if Ezio fails, Alvise will claim dominion over him for eternity, as befitting the sloth of the seven sins. As tensions rise and desires entwine, the stage is set for a tumultuous symphony of ambition, betrayal, and forbidden passions.

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