Toaru Majutsu no Index - Volume 4, Chapter 1: Hex Suspect of the Magician World.

Every human has their Personal Jewel of power, when awakened it can either be an Elemental Jewel or Physical Jewel. They circle the right and left wrists like bracelets of power.

More than ten years later, this sentence gradually spread in Elbaf Continent:

Never use magic to deal with tyrants, because you will find that he will return your spells to you thousands of times after being strengthened by countless magic specialties.

This is the story of a dragon-shaped self-propelled fort that keeps doing things in another world.

There is nothing that one magic can’t fix. If there is, then there are more. ——Izawa

- Description from novelbuddy

Enemies always meet on a narrow road and when they meet war breaks out.

They met as kids and fought but Zi Han lost.

They met in the army as recruits and even then Zi Han lost.

He lost again as he remained a sergeant while Yi Chen was promoted to the position of Marshal.

Even when his dark history swallowed him whole and shifted allegiance to become the Universe’s most infamous assassin he still lost to Yi Chen.

Zi Han, “Damn it! Why won’t you let me win.”

Yi Chen, “I can let you win in bed if you like?”

Zi Han, “……”

When did enemies graduate from rolling in the dirt fighting to rolling in the sheets….. fighting? That’s the million-dollar question.

.....

Shen Dong's marriage proposal failed, and he was dumped. That night, he was taken away by Chen Yuyan. When he woke up, Shen Dong found Chen Yuyan lying beside him. He was instantly dumbfounded. What made him even more confused was that Chen Yuyan actually said she liked him! And she had liked him for a long time!Chen Yuyan said, “Shen Dong, I want to be with you, but if you don't want to, I won't hold you responsible.”[Ding! The Ultimate Winner System is activated. The host currently has two options regarding the situation at hand.][First option, not taking responsibility for Chen Yuyan and pretending nothing happened, getting a reward of ten million yuan.][Second option, going to the civil affairs bureau with Chen Yuyan today to get married, getting a super gift package reward.]Holy crap! Holy crap!A cheat that could change his life had arrived!