There was nothing unusual about the day by the standards of Isekai Quarter at the very least, every student of class 1-B was listening to Roswaal L. Mathers lecture about how data structures work with varying degrees of interest when the unusual happened.

Out of nowhere a giant monitor dwarfing the size of the chalkboard came out of the ceiling startling everyone. The man who looks a lot like a clown nearly tripped over having not expected something of that size to appear right in front of him.

"My~ What an unexpected event~ I wonder who is responsible for it~." while he said it in his usual manner he was tense, he could feel the power radiating from the object's surface and it made him feel an emotion he didn't experience for many years.

Just as he backed away from the object many of the students stood up wondering what this about. "What is this...?" The first to speak was no other then the resident nasty eyes teen by the name of Subaru

"I don't know...?" The adventurer and fellow isekai protagonist by the same of Kazuma looked weirdly at the monitor ignoring the voices of his party members as usual.

"What is this contraption?" Ainz spoke out loud his thoughts being quite different from what he expressed 'Why is there a monitor in our classroom?' he wondered and if he could sweat he would, his senses told him that whoever was behind this could be troublesome.

"Whoever it is, is distracting us from this lesson." Everyone turned to the petite blonde girl in a comical fashion questioning her priorities but before they could be left to stew in their own curiosity any longer the world went dark.

In an instant they could no longer see the sunny day from outside the window but a dark void sending shivers down some of the occupants' spines. The only light left was the massive screen located in front of the chalkboard.

There was a figure on the bright screen, a man with various tubes sticking out of his neck and jaw from his mask.

"Testing, testing can anybody hear me? Hello it's live it's live ok. If you are seeing this message then I have to say I am disappointed as, not surprisingly, you failed yet again on the behalf of your precious little school society. That machine was your final warning to get your collective shit together, but alas, like all challenges to this "isekai" status quo, you snuffed it out without a moment's thought. I am thankful for that, it allowed me to find this place." the voice sent a chill out of everyone's spines, even the likes Ainz and Roswaal could feel the negative emotions charged in every word. Whoever the man was he was not someone to be taken lightly is what those not frozen by fear thought except one person that is.

The tracksuit wearing boy knew that voice, he is sure of that. It was very familiar but…. 'No it can't be him.' he shook his head snapping out of his stupor there was no way this man is-

"And now you have willingly placed yourselves at my mercy which I now have VERY LITTLE OF. Can you feel this power? It is but a taste of the divine retribution coming your way. And that goes double for you fair viewer." Everyone's thoughts were cut short by the venomous tone of the man and the power pressing on them, many of them could barely breathe, the few notable exceptions who seemed fine yet not less spoked were Roswaal, Ainz, Taya and lastly Subaru.

Suddenly the flat surface of the monitor rippled like the surface of a lake and a man calmly walked out dressed in a surprisingly casual and all too familiar set of clothes to the teen in a tracksuit. An orange tracksuit with it's jacked wide open showing the green shirt underneath.

Subaru knew only one person who was as attached to that set of clothes as he is of his own tracksuit. He didn't need to see underneath the mask to know what he would see and EVERYTHING WAS WRONG, HE CAN'T HE HERE.

"Thinking yourselves are safe due to that "power" of yours. Oh, the pleasure I will feel watching you squirm while your interpersonal ineptitude struggles to reckon with the fact that the 'weakest' of you is one who kept that illusion of safety and sacrificed so much without getting anything worthwhile in return was actually the most powerful person in this room. I will have retribution on you people who hurt him. Oh, how you will all suffer for that. AND IF THAT FEELS LIKE A PERSONAL ATTACK, THAT'S BECAUSE IT IS.'' Everyone flinched at the dark and malicious filled voice of the man, even though they couldn't see his eyes through the lenses of his mask certain members of the class could feel his gaze fall on them.

Suddenly the man's head snaps toward the frightened clown, the power and malice pressing on him fully, The man who lived hundreds of years shivered feeling even more powerless and scared then all those years ago when he faced Hector all those years ago.

"AND YOU, YOU HAVE KILLED MY SON SO MANY TIMES, IT'S A MIRACLE THAT HIS MENTAL STATE IS STILL STABLE."

"S-Son?" Roswaal uttered knowing just one person who the man could refer to, even under so much pressure his head turned to the boy he no doubt caused no end of pain even if he couldn't remember.

The figure chuckled making the Lord shiver in terror.

"So you figured out, if you used that intelligence to something besides being the most disgusting simp I know maybe you wouldn't be a clown in the first place. No woman would love a disgusting thing like you beside that stupid pink haired maid." the figure said in a patronizing tone taking great enjoyment in the man's expression going from fear to rage and then back to terror when the masked man pressed a bit more of his power on him.

The figure sighed knowing any more and the clown might pass out, that wouldn't do. He had to be conscious for what comes next.

The figure turned to the class, his sight instantly fixing on one person that unlike everyone else didn't watch him with fear but confusion and hope?

'My son I am sorry it took so long to find you, I promise from now on you won't suffer any longer and those that caused you pain will pay.' he thought.

"Son! Say what your power is, tell them what allowed you to save these ungrateful people all along." "O-Otou-san is this really you?"

"Yes son, we can catch up later now tell them your power and don't worry about the witch! Just say it, scream as loud as you can!"

"…. I can…. RETURN BY DEATH!"

Suddenly everyone froze except for two people which were Subaru and the mysterious figure. Shadowy hands manifested ready to grab everyone who heard the taboo words and end their existence but it only took an instant for all of them to be destroyed by the mysterious figure revealed to be Subaru's father. Small balls of fire flew from his outstretched hand and put an end to the unseen hands before they could reach their victims.

At the same time the man walked closer to Subaru and slowly, almost looked like he feared that the boy would shatter, hugged him. That was the scene everyone laid witness when the time returned to normal.

No one knew how to react to the bizarre scene, to see the mysterious figure that terrified all of them hug the boy who instead of trying to get away hugged the man back. The pressure from before was all but gone, for a brief moment everyone could breath easily

"Subaru, what are you—" the half elf was about to talk but she barely managed to articulate a few words before she toppled on the floor joined by every person from Re:Zero world. The other students watched and stupefied the people they know spasm on the floor, hearing their cries in anguish and faced contorted in pure despair.

Subaru heard it too and pushed the man away looking at the person who he is sure is his father with betrayed eyes.

"What did you do to them?!"

"I showed them everything you went through."

"Ever- no no no!"

Subaru's eyes widely went from one one of his friends to another seeing their bodies go limp but that was not the end of it.

"NO PLEASE GOD NO PLEASE TELL ME I DIDN'T KILL YOU SUBARU PLEASE." the blue oni screamed tears running from her eyes as she regained consciousness followed by the others.

Emilia hadn't woken up yet or just didn't want to after what she saw.

"Barusu…" her sister said her face green and trembling body, she didn't look at anyone her eyes settled on the floor.

"THIS IS NOT WHAT MY CONTRACTER DESERVES I SUPPOSE." the spirit screamed running to where she could feel her contractor as soon as she woke up.

"Baeko…" Subaru said with a lump in his throat as the little girl hugged his waist muttering something he couldn't decipher, he felt a hand settle on his shoulder.

"I know this was not the best reunion son but this had to be done, these ungrateful people caused you nothing but pain and it's about time you realize that too. When you think you are ready to talk please come home, your mother is waiting for you, we both are." he said, taking down his mask showing the face he knows well.

"D-Dad…"

"I love you son don't forget that." after the surprisingly heartwarming moment between father and son was over considering the circumstances the man turned his sight on the clown who unlike everyone else seemed to be smiling to the man's rage,

'This thing...after everything I showed him he doesn't care. He is just happy to understand how my son's power works.' the man saw red, he would have killed that thing in human skin if his son was not there to witness.

"You sick clown, if you harm my son again I will make sure to make you and that witch you are obsessed with suffer for eternity so don't even think about using him in one of your plans!

"Anyone who hurts Subaru will feel my wrath, am I clear?!"

Roswaal silently nodded his head in fear, his mind assaulted by a new set of visions. This one's showcasing exactly what fate awaited him if he harmed even one hair of man's son.

"Now that my work is done, You people better treat my son right or I will come back." He snaps his fingers and he just vanished out of sight just like that.

Nobody could believe what they just witnessed but out of all the people, nobody was more surprised than Subaru