Killed again, Mr. Detective.

Sakuya Otsuki is a high school student determined to uphold the legacy of his father, a legendary detective. Accompanied by his devoted assistant, Lilithea, he pursues a career in investigation with unwavering ambition. Yet this young sleuth harbors a highly unusual trait that sets him apart from ordinary investigators. No matter where his inquiries take him, Sakuya inevitably becomes entangled in his own cases in the most fatal way possible—by becoming the murder victim himself. This extraordinary cycle continues when Sakuya accepts a challenging new assignment requiring him to infiltrate a luxury cruise ship. True to his bizarre fate, he finds himself killed once again during the operation. However, death does not mark the end of his investigative journey. Each time he opens his eyes after meeting a violent demise, Lilithea is waiting faithfully by his side. Together, they resume their pursuit of the truth, transforming his repeated deaths into an unconventional method for unraveling every mystery they encounter.