An Immortal's IF-Route Observation Manual

Nagi Izumi is a person who was cursed with immortality and has the ability to transmigrate.

He supposes he still counts as human. He rarely thinks about it.

As an employee of the New World System, his job is to observe the countless parallel worlds born from anime.

No matter what happens in these what-if timelines, Nagi Izumi can only watch from the sidelines.

[The Reborn Boss]

When he opened his eyes again and saw Osamu Dazai in front of him, wearing a red scarf and barely alive, he punched him without hesitation.

He didn't know why Osamu Dazai wanted to die. He didn't know what those two boys knew. There was so much he didn't know.

Even after starting over, he still didn't know.

[Satoru Gojo, Repeating the Shinjuku Showdown Countless Times]

He had become skilled at tuning out his students' comments, and could no longer manage the joking smile he used to wear so others wouldn't fear him.

He only looked out the window at the sky and wondered: How long until summer?

[Suguru Geto, Now a Ghost]

Suguru Geto, caught in Satoru Gojo's endless cycles, looked at a world both different from and similar to the one he had envisioned.

Even as a ghost, there was little he could do. Right now, for instance, his hand passed through Satoru Gojo's shoulder once again.

[Hiroki Hagiwara, Who Willingly Fell into the Abyss]

If the world needs someone to be its moonlight, why does it have to be Jinpei Matsuda? I will turn back the tide of time and let the dead remain in this world.

[Theodore, Who Obtained the Script]

What would a man do when he had lived for a thousand years, given everything for his ideals, and learned that his past, present, and future had all been written long ago?

[Tanjiro, Turned into a Demon]

His tragedy began too soon. Controlled and imprisoned, he was stopped countless times from taking the road to his death.

When he stood beneath the sunlight and felt its warmth, whole and unharmed, he wondered: What if he truly couldn't die?

[Rei Furuya, Bound to a System]

It seemed his whole life had been shaped by choices made because of this so-called System. Every time he made a choice, another existence was discarded like trash.

Until one day, he stood on the stairs leading to the rooftop, facing yet another choice.

Someone once asked this outstanding employee: After seeing so many tragedies, do you still want to live?

Nagi Izumi gave the same answer as always:

"I will always look forward to another tomorrow, alive."

Please note:

* Apologies for the OOC characterization. There are original settings.

* I started this just to write melodramatic, tragic tales about beautiful, doomed characters! This is always my favorite kind! If it bothers you, please stop reading!

* I'm sensitive, but open to suggestions. Please don't insult me, QAQ.

* 2025.3.15

Theme: Strive toward a better tomorrow