A young man with amnesia, Kamishiro Towa, is selected by the System and becomes a mission-taker.
The System promises that as long as he gets the world to believe he is a "World Observer," he can recover his memories.
With no other options, Kamishiro Towa has to deceive a bunch of honest people while putting on his secret identities and giving the performance of a lifetime.
.
Honest Person No. 1, Gojo: "Wow, is this the kind of 'magician' who becomes a wizard if he turns thirty without having had sex?"
Kamishiro Towa: "Magicians are people who use the 'giving emotions physical form' technique. They don't necessarily have to be virgins."
Gojo: "Tch, so they're basically the same as jujutsu sorcerers."
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Honest Person No. 2, Amuro: "What are they like?"
Kamishiro Towa: "Magicians aren't very loyal. They might betray their organization at any time."
Amuro: Got it. With a good enough hoe, there's no corner you can't dig under.
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Honest Person No. 3, Dazai: "Can magicians give me the death I want most?"
Kamishiro Towa: "Of course. They kill without batting an eye, and they're extremely cruel."
Dazai: "Awesome!"
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"Jujutsu? Don't make me laugh. The only one who can kill me is my darling."*
"Even if future generations call me a disgrace to my country and remember me with contempt, I'll still protect my homeland."*
"My magic is called 'Reaching Out to Those Beyond Redemption.' That means I can't simply stand by and do nothing for you."
The supreme bishop who once belonged to the world's greatest magical society, the British princess who wields Curtana First, and the female pope of the Church of the Cross, a saint born by nature.
Gojo/Amuro/Dazai: "What the hell, these are magicians?!"
Kamishiro Towa: "What else would they be?"
*: Some lines have been adapted from A Certain Magical Index.
◆ Reader's Guide:
◇ The characters are very out of character, there are lots of original settings, and the timelines are all jumbled together.
◇ There are crossover cameos from other works in the same series.
◇ The protagonist and his secret identities are extremely powerful.
Theme: Seeing is believing; hearsay is unreliable.