Plot Outline.

ACT 1 (Completed)
Upon being approached by NOAH Itsumi is offered a job to investigate an Allagan Research Facility recently uncovered in Mor Dhona, its believed to be tied to the Crystal Tower in some way and that the Allagans were researching ways to traverse to other Shards of The Source, besides The Void. Deciding to take the Job Itsumi brings it to ACI who takes the job and discovers the truth behind the Facility amongst various other things? Itsumi discovers a series of documents regarding the facility's purpose and theories upon potential travel to other Shards, though none of them have been tested. While the others discover other things (No one seemingly discovered anything else beyond what was presented R.I.P.). Itsumi reveals her identity to both Fu and Nym and the fact she is from another world, she has a 1 on 1 with Cherche expressing her desire to return to the First.

Feedback
Overwhelmingly positive, suggested not to have Itsumi give everything if there is a need to interact with Plot Characters luckily already planning this.

ACT 2 (Unknown, considering reworking or working off how things turned out need to consult people further.)
Itsumi during the downtime after the NOAH Job begins to work with the document she found on finding a method to return to the First believing the method to solve this was through using an Atomos and using The Void as a sort of slingshot of sorts the method is but a theory and there is nothing to suggest one would not merely end up in the Void as a result worse is the fact if successful unless one is able to attune with an Aetheryte travel home would be impossible, resulting in Itsumi not wishing to risk anyone else, in an attempt to bring this information to ACI it results in a mostly negative response and Itsumi leaving unclear as to what she should do or shouldn't do... Despite this, her heart is still set on returning home especially after being approached by a mysterious figure informing her if she doesn't everything will be lost for good and that there won't be anything to return to.

Feedback
A fair amount, including providing better reasoning to go to the First beyond Itsumi's own need if I go to the continue with what I had a route I've begun writing a potential way this can happen.

ACT 3 (Work In Progress, this was drafted under the impression that ACT 2 played out how it was originally intended.)
With the information provided by the Cloaked Figure about the sudden but also oddly planned out attacks by Sin Eaters as of late, Itsumi deems it necessary to potentially investigate the cause of this while also wishing to see what remains of her world and what has changed of course while also figuring out how The Crystal Tower and more importantly the Crystarium came to be. The endpoint of this would be discovering the mysterious Cloaked Figure who reappears is in fact an Ascian rather 'former' Ascian and also the same 'Mage' figure that Cherche saw in Itsumi's Echo Vision and the person who cast Itsumi into the Aetherial Sea, to begin with.

ACT 4 (WIP)
Itsumi decides to fully share what happened to her before she arrived at the Source and recounts the clash she had by sharing her memories with the other members of ACI present. Finding it difficult to believe one of her mentors is alive still but also an Ascian she is clearly distraught despite this fact she still wishes to keep investigating the 'Sin Eater Attacks' and doesn't believe her mentor and the father-like figure would suddenly begin aiding them. Traveling to the Rahtika Greatwood as rumors of Sin-Eaters gathering in the ruins around there are about, the 'Ascian' would appear again and inform them that they share a common cause of wanting to stop the Sin-Eaters. After investigating the ruins and putting a stop to the Sin-Eaters their 'temporary' ally wishes to speak with Itsumi alone upon their return to the Crystarium.

ACT 5 (WIP)
Itsumi begins to feel more distant, however, a recent report leads the group to travel to Eulmore and investigate recent disappearances outside of the city limits once again their 'Ascian' friend shows up and points them to Mt. Gulg where remnants of Sin-Eaters having taken to stay. After clearing out the Sin-Eaters Itsumi still appearing to be distant and keeping to herself suggests they return to the Crystarium as they've done 'enough'. After discussing the details of what they've found so far neither the Mines, the Ruins nor Mt. Gulg had the same calculated attack as the Village they protected leaving Itsumi curious as to the meaning and deciding to go read up on what she can by herself. (If she is joined by someone this would result in a 1-on-1 sequence where said person may come into physical conflict with Itsumi as she runs off by her lonesome.)

ACT 6 (WIP)
If someone had joined Itsumi the event would open by explaining what had happened specifically and that Itsumi seemingly left with nothing but vague intent and words with her. With no idea of the why or reasoning the logical conclusion is to let Itsumi do what she does and drop matters on The First, albeit that is until the 'Ascian' arrives informing them of the true intent behind his plans he had been manipulating the Sin Eaters to arrive and manipulated events to ensure Itsumi would return to the First in need of another Echo User he has plans to bring 'Salvation' to the Source by opening a Voidgate and clouding the world with Darkness again in hopes that tipping the scales may speed up the process of life returning to the rest of The First and he would use Itsumi to help achieve his goals for what purpose and to what ends is unknown but he revealed the underneath the sea is where they may find 'them' if they truly think they can put a stop to him. The only way to confront the Ascian underneath the 'sea' is by making use of the creature known as Bismarck to bring them where they are needed and upon doing so the group finds themselves in the remade city of Amaurot nothing but an illusion created by an already Ill-Fated Ascian that the Warrior of Light (Darkness) put a stop to a year or so ago. Traversing through where the Ascian has located results in a final confrontation with Itsumi who believes that what she has been told will help save her world.

ACT 7 (WIP)
Upon defeating Itsumi the 'Ascian' reveals himself and his true intent to Itsumi. Claiming he had manipulated events in hopes that Itsumi would prove to be a calculated weakness in the group and possibly split them and kill them in the aftermath. Regardless he reveals that he will be opening a Voidgate by making use of the Crystal Tower and that their efforts in Amaurot were for naught. Leaving Itsumi reveals she had been used and that it was likely her powers had been used to help with creating the Voidgate he needed and that she would put an end to this farce herself if she had to want to put whatever Ill feelings there were aside for what was more important stopping the Voidgate from opening. Returning to the Crystarium and the Crystal Tower the final confrontation between the Ascian who reveals his true name to be 'Nyx' and ACI takes place.

Epilogue (Itsumi)
After burying her old 'friend' and finally saying her goodbyes as she makes one last visit to Ill Mheg where she first was recruited to join the Adventurers she journeyed with the First. Itsumi leaves her Scythe behind as a 'burial' to the old her and decides to return to The Source for good having finally found the closure she was looking for and ready to start the next chapter in her life no longer chained by her past. Goodbyes are said and one and after finally returning to the ACI headquarters confides in the others that she wishes to be referred to her by her true name for good as Itsumi was just another part of her past that she needed to finally bury. She Journeys to Rose's gravesite overlooking the Cartaneu Flats and takes a seat next to it smiling as she says she has been on a very long adventure and believes Rose would want to hear the full story.