Kamui the Monster 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

A mysterious gigantic creature called “Shindo” suddenly appeared and enveloped Japan in fear. At the cost of many lives, a nuclear bomb was successfully used to halt its movement. However, following the incident with Shindo, giant creatures began to emerge all over the world. And once again, they appeared in Japan…
A young man named Shidou Yamato, drafted into the battlefield, fought valiantly with his inherent skills, but found himself powerless against the overwhelming threat. Amidst this, the Special Headquarters For Countering Gigantic Creatures, “Shinonome”, approached Yamato with a proposal. What path did humanity choose to fight against the monsters…!?