"Mmm... No Diego Cortes isn't related in that quest. That is the unfinished quest, part of main story of MC's discovering their true origins.
This is what I know about Diego Cortes
-He is rich, due to him stealing a Meta Serum from an old rich guy that likes him implicitly he killed the guy for both the serum and the old guy riches (which he made a business about, Papito XL (ever heard of it?) Yes, Diego Cortez own it. (The sex toys are his brand and also where the sex droids come from.
-He lives in the Confinement Ring, In Nexus Nova.
-His meta powers is limited omniscience, meaning everything happens around him. Even how small it is, he knows. So whether you only meet him by chance is just a sign that he might be interested to you, due to him sensing what happens around him and little glimpse of the future about the person he just caught with his limited foresight.
-Again he is not related to the Praharma, a lot of people still waiting for the big reveal of that cause it still on going and not develop yet (look around the logs on the version of Lust Odyssey if there is update regarding that.)
-The Praharma of Akra's name is Phobos, (personification of fear)
-Whereas the Praharma of Atlas-9 was Arihama (Ares as Phobos called him). Which you did defeat and absorb his powers.
There are two plausible explanation for that mission. Either you go to Harmonia (Planet) by exploring the Galaxy after you defeat Arihama) and go to the Magic School there (to learn the concealment spell)
The other one is catasthropic, if you read the lines there you know what will happen if you go up there without anything the quest asks. (still WIP though).
Thank you very much!! :3 but all this is unavailable to me for now (how to open Harmonia? and Nexus-nova - I have nothing active there, although there is a task to steal a brain... I am at a complete dead end. So I can safely ignore Diego? He is not important for the main plot and progression? and also I have Mister X as a prisoner and he will suffer for his crimes
thank you and forgive me for disturbing you. Can you give me a hint what to do? I have a feeling I'll have to replay... I accidentally left the academy and now I can't get to classes again. The only interaction I have is making a potion with the Centaur (I don't remember his name) (I did it wrong in class and they told me I was wrong and Damien or whatever his name was will do it for me) The game won't let me start a new day - "day 6 is a work in progress"... what should I do?:( 
What do you mean about wrong? You soft lock yourself on the potion making because there is NO SAVE OPTION when inside the university, if Damien help you in this part there is no problem. But if not, I don't know about that anymore. I'll try to post the potions formula here. If that's what you ask.
The way you can save again in the game within transitional days in the university was you going back to the ship so the UI shows up again so you can save. You can exit the university at end of the classes.
But for now, I can't give the info because I restarted my whole game and I am not yet in the University as of the moment.
You didn't read the part where Gabriel invites you in the festival? I don't remember the specifics but it is a fair where your gold will be change into ticket (as your special event currency) whenever you go to Eldor, on a weekend Saturday usually night. If he invites you then the event will open up naturally and that's it.
how I want romance with Egon! But i liked asmodeo too! he's such a child, especially when he asked and i gave him a thousand credits T_T how should i choose one of the men now??But Asmodeo made it clear that I would not be alone with him, even if the main character chose him and when he was naked in the club and asked "now come kiss me"! And I liked Gabriel too. I would really like for us to have a choice at the end of the game which man we'll stay with. and i don't know what to do, what if one of them rejects me, knowing that i flirted with the other. and what a cool jealousy scene with egon in the bar! Of course there are not enough tips on how to get the maximum romantic points with love interests. You know, in the future we will have a choice of one of the men to love and all that? And I'm very sorry that the main character is barren, but I want to believe that in the end something will change with the one she chooses
Diego Cortes also is a unfinished (unable to deploy yet) character. He was made as a secret character along with Isaac (your ship's previous captain).
This is the rest of the crew if you follow all side quest and main quest.
Removable character through certain scenarios or if you skip the side quests:
Rylan, Katari, Bradley, Skru'Vaks, Phoenix, Feraldo, Jhaan, Hakkon, Cicero, Alastor, Diego Cortes (still cannot be part of the crew yet W.I.P), Master X (Xperiment-fictional character of the game's author himself), Levi, Asmodeo, Isaac, (Jhaan's and Sammuel's former crew members, unimplemented yet).
Characters that is essential and they cannot be remove in anyway as of this version 43.3:
(Sammuel and Arthur)
He is one of the most hidden character if not mostly you grind that much, cause you'll spend half- a game year. (I mean the game's date not yo be confused with real life dates).
"He is Arthur's bestfriend and also not the original captain of the ship, cause they are the one who stole the ship in Paradise along with Arthur, he is also one of the sweetest crew, though his hardship made him to be an extremist of the rebel faction in Pangea (the planet [still not visitable]. He is one level headed and not weird like the other crews, speaking which *cough* *cough* Zyron, Bradley, Rylan, Feraldo, Phoenix, Skru'Vaks, not even the jealous Egon will top notch this logical extremist. Hahahaha
"He will not obligate you to reliquish your position as the ship's Captain. He is a good person though I don't like his reasoning. Just read his context.
