In his life as a hitman, Marco never failed to eliminate his targets. Known throughout Italy as “The Oracle of Florence,” he made a name for himself executing his missions quickly and silently, with no hesitation. However, one day, in the course of his work, he comes upon a remarkably cute figurine that will change his life forever! Determined to track down the source of such a charming visage, he leaves Italy behind to immerse himself in the world of anime, manga, and games! But his departure ruffles more than a few feathers, and now, with a bounty on his head, Marco can’t let his guard down just yet...

Marco, a former hitman turned anime aficionado, is going to Comisa, Japan's largest fan fiction convention, and intelligence officer Viviana and her colleague Andre are tagging along too! However, Marco may not get to enjoy the festivities for long, as an uninvited guest emerges from the shadows...

Marco's mysterious past comes to light, including his nerdy awakening! Meanwhile, a certain organization on his tail begins to close in...