worlds strongest player gets reincarnated as a girl

Touma Kazuya is a college graduate student. He doesn't have the perfect life that he wanted. He's experiencing depression and extreme sadness because of what happened to his loved ones. His father died in a car accident when he was 5 years old, his mother died of an incurable disease during his elementary days and his girlfriend was raped, robbed, and brutally murdered and now all that is left is her sister assisting him in daily life. Things are very tough for both of them and Touma chooses to stay away from life and becomes a shut-in gamer. He always spends his time playing the most popular MMORPG called Era of Warriors where he plays the 2 characters that he created named Diablo and Lucifer. He doesn't have any idea that the game is a real fantasy world. His gaming characters have been greatly changing this world and he doesn't have any idea about it. Not all of the people who live in this world like it all including the Gods, Demonoids, and Asmodeus subordinate, and as a result a great tragedy falls to earth. All of the players of the era of Warriors were being slaughtered without showing any mercy and Touma is one of them. However, he got lucky to get reincarnated but due to certain problems, he reincarnated as a girl with weaker stats. He thought this is the only problem that he will have in his second life but he has no idea that things are just getting started