Tsugumi Project is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Leon, an elite soldier from a militaristic Europe, was forcibly embarked on a secret expedition. In a ruined Japan, abandoned for more than 200 years, he and his companions in misfortune must recover a terrifying weapon. Its code name: Tsugumi. All we know about it is that its destructive potential is such that the world has preferred to crush the archipelago undera shower of atomic bombs rather than see its development completed... But the operation turned short: the plane crashed, and Leon found himself alone in Tokyo Bay. Hungry, at the end of his strength, with only