In this story, a Demon King asks a heroine girl something, "Heh, good luck enjoying your peace, worm, because I will com-" The girl just stabs him and tells him, "Don't start this BS and just die." She just killed him in a single attack, and the Demon King is dead. She finally sighs and finally stays on the ground and asks herself, "Finally, this all shit is over, right guys?" And we see all her friends are dead around the place.
The story continues where a small boy is born, and he just looks at the woman from his eyes and asks himself, "Looks like I'm finally back in this world," and he says in his mind while looking at the woman and asks himself, "So a human birthed me, huh? That's cute when I'm going to kill them after I grow up and recover all my powers." The woman hugs the baby and just smiles and asks herself with a smile, "You are more handsome like your dad and have everything of your mom's eyes," and the baby looks at his body and says to himself with a sad face, "I'm going to die on Earth by staying in Earth people's house even though I'm not grown up."
After many years, the baby turns into a 10-year-old kid who's going to school and talks to himself with an evil smile, "Hehe, a little more time and I will have my full power and body to destroy whole humanity itself," and he sees the school he's going to study and asks himself, "If I'm not wrong, some decades have passed after I died with those all heroes and even her too." He is excited and asks himself, "Maybe I can even know what happened to her and what lessons they put there."
He goes to school and acts nothing different and sneakily peeks at a book about the events of the battle of the Demon King's death, and he sees that the girl who killed him when he was Demon King back then is getting blamed by all the people of the entire world. He reads that she has locked herself in a room where no one ever wants to meet her, and he just looks at the cover with a shocked face and asks himself, "How is this possible that the heroine who killed him and saved whole humanity is getting blamed that she let all her friends and some people die in battle because she was the strongest hero at that time?"
Before he was about to say anything, his history teacher (female) asks him why he's reading a book secretly from anyone, and she asks him with a cold stare, "This is strange-a new kid already curious to study history is unbelievable." He waves his hand and tells her he has heard about the world hero fight against the Demon King and his forces and he always wanted to know that kind of stuff. The teacher smiles at him and grabs his head saying, "That's awesome to know you enjoy knowing about something you want to know," and she asks him, "What do you want to know about this thing you're reading?"
He asks her why all people on Earth are blaming her when they should understand the Demon King killed them and he's blamed for everything-people he killed. The teacher looks surprised and asks him, "Wow, that's a good question you ask when you're just 10 years old," and she explains that the hero girl who killed the Demon King has a power that can match the Demon King himself. She just points her fist in the air and says the hero girl was born to be equal to the Demon King, but her whole friends held her back and stopped her from using more because she would destroy everything if she's around. The teacher says to him with a little bit different tone that the hero girl didn't try to use all her power in the battle, and due to that reason, people are blaming her because she was holding back before all her friends died in battle with the Demon King and his forces.
He says to himself, "She really was that strong huh? Who was at my level but didn't use it due to her friends being there," and he was about to speak to the teacher until she leaves him saying, "Don't read too much or else you won't be able to enjoy your life as a kid," and she's gone.
He goes home talking to himself, "This is crazy huh? Who saved the entire world is getting this kind of blame when she should get rewarded instantly." He goes home and his mother hugs him tightly and says to him, "What's your day, honey?" and he's coughing and saying to himself, "Mom, please let me breathe a second," and Mom makes her hug soft and asks him, "So, anything new you learn in school?" and he just says to himself, "Man, this woman is crazy that I was sucking her milk from birth and she's the gentlest person I have seen in my time."
He tells her that he just read some book that talks about how the hero girl was blamed by the entire world, and Mom just stays silent and asks him to go to his room and she will cook food for him in the meantime. He was about to say something to her, but she glances at him with a cold face and he goes to his room in panic and asks himself, "This is different. How is this Earth mom mad at me after saying that?" and he just looks at his hands and asks himself, "It's time I use some of my power even if I don't have my whole power."
When night happens, he goes to his mom's room and places a hand on her with a smile and says something: "All of your past is now with me," and he starts to see mom's life. He sees that his Earth mom was the hero wife who gave birth to him, and the hero girl took her child to an orphanage. Her child was raised from birth to her 6-year-old age without any parents. He sees that his mom blamed the hero girl, who was her mom, and has a feeling that the hero girl let her father die in the battle with all the people the hero girl made at that time.
He takes his hand off her and asks himself, "This isn't what I expected-that the woman who birthed me and was a hero girl's child. I never thought this." He closes his head and says, "I will go to that hero girl's place because I want to see her." The next day, he walks through the town and asks some people about the hero girl's house, and one person tells him the location with a message: "Don't go there, or else it's not going to be good."
He finds the house and knocks on the door, and an old woman comes outside and asks him what he wants. He just asks her if she's the hero girl, and she gets angry and tries to shut the door, but he grabs it with one hand and asks her for answers. She feels something strange about him until he completely grabs her neck and asks her with a cold face, "You will give me all the answers no matter what."
She takes a deep breath and lets him enter. He sees her house is very old and the place is nasty. He sits on the ground and asks her if she's regretting her life right now by doing all the things. The old woman smiles and says to him she regrets nothing and she did everything right. She was going to do what anyone would do in her place. He asks her if she is happy living like this, but she doesn't give any answer.
He understands her reason and takes one last glance at her and says to her, "I'm sorry you're living like this," and says to himself, "my greatest rival." He shuts the door and looks at the town and says with an evil smile, "Let's destroy everything." He takes on his Demon King disguise and goes to the town and traps everyone there while laughing at them and says to all of them, "Hahaha, this is what you're best at huh? You can't even stand against me."
Some warriors are coming to him, but he tells them to find the girl who killed him many decades ago. An old woman gets a message from a warrior, and he's asking her to stop the Demon King. She's shocked and says she has already stopped being a hero and she can't fight anymore. But he begs on his knees saying if she doesn't come, the Demon King will kill all the people including her child and her grandson.
The old woman looks at the town barrier and says to herself she will do it. After some time, the old woman goes to the city area where the Demon King is looking down at her with a smile and just says to her, "Old hag, your time is over." The old woman gets so angry she flies to him and tries to punch him, but he grabs it and punches her face so hard she coughs up a little blood. She asks him in anger, "How are you even alive?"
He says to her, "A Demon King, when dead, can get rebirth," and he was born in this Earth. He looks down at the town saying to himself, "Now it's my turn to finish what I started." The old woman tries to stop him, but he traps her in a barrier box and she can't do anything but watch as the Demon King heads to the town.
The Demon King looks at all the people and says to them he will destroy them without mercy, and he charges an attack so powerful it will destroy everything in the town. But the old woman destroys his attack with her sword. The Demon King asks her in anger, "How are you even here?!" and she answers him, "When you trapped me in the barrier, I lost all hope until I got a vision of my grandson asking me to remember who I was."
She tries to remember everyone who fought beside her in the battle and regains all the power she had in her prime. The Demon King laughs at her saying, "You finally remembered, but without your friends, you will never beat me in that battle." All the people hear that and ask themselves, "We have been fools to blame her when she won the battle and didn't let her friends' deaths go to vain."
The people cheer her and say into the air, "Defeat the Demon King and save all of us!" The old woman hears them and smiles and moves so fast that before the Demon King can say anything, she stabs him in the chest. She asks him, "Ready to die just like before?" The Demon King looks at her with a smile and she can see the change in him.
She creates an explosion and both of them are thrown out of the town, while the people think she killed the Demon King with that attack. She throws the Demon King to the ground and asks him with a sword pointed at him, "What happened to you? You don't look the same like before we met in our battle."
The Demon King grabs his wound and says to her, "Why don't you just kill me instead of dragging this?" She sits on the ground and asks him with a serious face, "You aren't the same Demon King I met, who was bloodthirsty and prideful to do anything. You didn't even destroy all the people when more than 20 minutes had gone until I stopped you." She asks him with a curious face, "What happened to you? If you were the same Demon King I met, then you would've killed or grabbed anyone for your victory."
The Demon King becomes silent and removes his disguise and says to her that he knows what she's been through. She looks surprised and asks, "Aren't you the same kid who just came to my house this day?" and he smiles and asks her to hold his hand. She sees all the things he did and even sees that this whole plan was for her to get her blame removed, and she even sees that the voice she got the vision of her grandson was from him.
She hugs him tightly saying to herself, "You little demon, how dare you do all that stuff keeping secrets from your grandma!" and the boy asks her if she wants to go home and see her child. The old woman nods. Both go to the house and the mom sees him with a wound in his stomach and asks the old woman if her son was in any accident, but she just waves her hand saying, "No no, it's just that he was playing around with his food and it made a mess on his skin."
The mom sighs and says, "Thank you for bringing him," and the boy says to her that she's his grandma. The mom rubs her eyes and asks the old woman in shock, "Are you really my mom?" and the old woman says yes. The mom becomes awkward and says to her, "I really misjudged you, Mom, for many years, but..." She grabs the old woman with a hug and says in a crying voice, "After knowing what you did today, I know we were all wrong about you."
The boy looks at them with a smile and the mom takes the old woman to the room saying, "
Why don't you first come inside Mom ?"
The end