God-level Bodyguard in The City - Chapter 23

I, Hyoudou Issei, am a 2nd Year High school student and my age is equal to the number of years I haven’t had a girlfriend. And, someone like me got a girlfriend! I’m sorry buddies, I will walk the path of becoming an adult before you guys! – That’s how it was supposed to be, but why did I get killed by my girlfriend!? I still haven’t done anything yet! Are there no Gods in this World!? And, the person who saved me is the most beautiful girl in my school, Rias Gremory-senpai. I learned the shocking truth from her who isn’t a God but a Devil. “You have reincarnated as a Devil! Work for me!” Lured by Senpai’s breasts and treats, my life as a reincarnated Devil began. So the “Academy×Love Comedy×Battle Fantasy” starts here with just aggressive and worldly desires!

Beautiful doctor of Chinese medicine, Yu Gangan woke up from a coma one day to a cold, mysterious man. “Excuse me, you are…?”

A pair of profound eyes focused on her and replied, “Fang Zhihan, your husband.”

Did this man take her for a fool? He was obviously a fraud!

A little while down the track, he pulled her into his arms and whispered beside her ear, “Who am I?”

This time, Yu Gangan froze and replied, “Fang Zhihan, my husband.”

If he was a patient, then she was his sweetest medicine…

- Description from Novelupdates

The path of a demon lord is not one to tread lightly when the very world you turn against you. Very few could walk this road without losing their way.On Ryuji’s first day, he and his class get summoned to another world. The moment he arrives the entire class is given power from the goddess of light, Lumina.However, the calamity star appears affixed to Ryuji, and he faces a dangerous and unknown future. The red star's existence warned of the rise of a demon king and the coming chaos to the world.In order to survive and fight against this fate, he gained the class [Berserker] a tool for him to survive in this world.Despite a warm welcome, the obvious happens, and the king asks them to aid them against their enemy, the current Demon Queen. However, the kingdom is keeping something secret from the heroes.With a beautiful fox maid, Ryuji lives his life without constraints. If he wants to help, he helps. If not, he won’t. Armed with a colossal axe, Ryuji revels in the thrill of battle, relishing the opportunity to crush his enemies, regardless of their size!“Tell me. Why do you attack the demons without reason if you desire peace?”

At the genesis of the world, the ‘Dark God Entropy’ was defeated in the fight between the five other Gods, and was sealed.