A camping trip for the family of retired legendary hitman Taro Sakamoto becomes an unexpected battleground of egos when his clairvoyant protégé Shin Asakura and the elite assassin Nagumo engage in a fiercely competitive fishing contest. The peaceful wilderness quickly becomes a stage for their professional rivalry, threatening to turn a simple vacation into a chaotic spectacle.

Beyond this lakeside showdown, the light novel shifts focus to other members of this world of killers navigating civilian life. The meticulous and onion-hating assassin Shishiba takes his disciple, the childish but deadly Osaragi, on a culinary journey through the world of ramen, exploring how even the most dangerous individuals find pleasure in simple, savory meals. In a more modern tale, the enigmatic Kashima attempts to manage his deadly assignments through remote work, a concept that clashes humorously and violently with the hands-on traditions of the assassin trade.

These episodes form the core of a collection designed to expand the universe of the original story, moving beyond the high-octane action of the manga to offer a more intimate look at the daily lives and quirks of its cast. The narrative focuses on the inherent paradox of being a former or current killer trying to find a place in a peaceful world, exploring the internal conflicts and unexpected moments of tenderness that arise when deadly skills are applied to mundane tasks. The light novel is authored by Renka Misaki under the supervision of original creator Yuto Suzuki, and it was published in Japan by Shueisha under their Jump J-Books imprint before receiving an English release by VIZ Media.