Sekai Saikyou no Kishi wa, Kanarazu Shinu Heroine wo Sukuu Tame Isekai Demo Saikyou no Kishi to Naru ~Ryoutei ni Hana wo, Ryoute ni Ken wo~ 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

He who fell in love with the heroine overturned her destiny to save her from her timely demise. Abandoned by his parents, bullied in high school, and left in solitude—a young boy named Mikazuki Kenya. At the brink of despair, he encounters a fateful meeting in his only hobby, VR gaming. A meeting with “Kaguya” and “Reina,” the heroines from the immensely popular game “Knight of Giant.” The time spent with the two heroines saved him, and he was head over heels for both of them. However, in the story, one of them is destined to die… To change that fate, he dedicated his life to mastering the game and becoming the strongest in the world. Suddenly, Kenya finds himself entering the world of “Knight of Giant”?! The strongest gamer embarks on a heroic tale of becoming the strongest in another world, in order to save the heroines he fell deeply in love with. The story begins.