Sono Otaku, Moto Koroshiya.

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...

(Source: Yen Press)