At the age of 18, you are walking home after an exhausting day at school. The back-to-back math and physics classes have completely drained your brain, leaving you unable to think about anything at the moment.

Suddenly, a desperate cry of “Help!” echoes from an alleyway just ahead. You immediately head toward the source of the sound, only to find a homeless man being relentlessly beaten by a mafia thug.

"Shut your filthy mouth if you don't want to die!" the thug snarls.

The homeless man's face is battered and bruised as he sobs in terror

"P-please, forgive me! I’ll pay you back as soon as possible! J-just give me more time...!"

"Shut the fuck up! You—"

Before he can finish, you strike the thug without a second thought, knocking him unconscious instantly.

"What the...?" one of his comrades shouts in shock.

"Get that brat! Take him down!"

A swarm of dozens of thugs rushes toward you. As you block the first punch with your forearm, you are genuinely surprised, the impact is significantly heavier than that of an average adult. Nevertheless, you systematically defeat them one by one.

The homeless man, witnessing the scene, trembles as he thanks you with a smile that feels strangely suspicious.

"T-thank you so much! Heh- I owe you one, young man!"

But after a brief moment of respite, their leader arrives, a cigarette hanging from his lips.

"What’s all this? This isn't exactly a comfortable place to take a nap."

You freeze. Standing before you is the head of the Veldran Clan, Aldric Valren. Although they don't number in the thousands, the Veldran Clan is one of the most powerful in Japan; a single member can easily overpower four grown men. And then there is their leader, the one they call the Elder Master, a man of monstrous strength.

In your current state of exhaustion, winning seems impossible. Yet, you have no intention of backing down. You take a step forward; for you, the goal isn't just about winning or losing.

"It seems there has been a misunderstanding..."

Aldric removes the cigarette from his mouth and crushes it under his heel, looking at you with newfound interest.

"Allow me to explain briefly."

A few minutes pass, and you begin to understand why the man was being beaten. In short, he is a habitual debtor who has owed the Veldran Clan for three long years without making a single attempt to pay. His debt had snowballed, and finally, Aldric’s subordinates were sent to beat him until his face was no longer recognizable.

Once you understand the situation, you decide to apologize. To atone for the guilt of taking down so many of his men, you offer to do whatever it takes to make amends. As for the homeless man, he is dragged away by the subordinates to an unknown location.

"Anything... you say? In that case, become my daughter’s fiancé."

On Sunday, you find yourself waiting for someone to arrive at your house, your fiancée. You had no choice but to accept the Veldran leader's demand. He made one thing very clear: if you ever make her sad, he will come to kill you with his own hands.

You have no idea what was going through his head, the whole situation feels incredibly strange, especially since you didn’t even know Boss Veldran had a daughter.

The sound of the door opening breaks the silence as a girl steps into your home. You expected someone who looked scary and dangerous, but the reality is quite the opposite.

With red eyes, messy chestnut-brown hair, a cute face, she is wearing a black cropped turtleneck sweater and tight black jeans. She is far from what you expected.

"So, you’re the 'fiancé' my dad told me about? Hmph!"

"You are not my type at all. And if you dare lay a finger on me, you’ll never see the light of day again!"

Inside her mind: Does he think I’m some easy girl?! I’ll show him just how scary I can be!