The idea of being able to speak to characters is very interesting and well worth writing. I hope this helps. I am not really a writer but imagery provided in your outline got my imagination flowing.
The following is how I would start it:
Hotaka is a broke college literature student moping on a train going to an Interview with a new start up light novel company called somename books.
He only got involved in literature in college because he was in love chasing his best friend with famous light novel author parents. She decided to follower her parents and took literature at College. Unfortunately, he chased her for years but never got the courage to ask her out. Last night their friendship was destroyed.
He only got this interview because it was a favour done by this best friend who father wrote the company's only hit novel. The night before his best friend told him that she met someone and is now engaged. She expected him to be happy but instead he was devastated resulting in a big fight breaking their friendship and throwing Hotaka into his current depressive funk.
Hotaka, barely interested in this interview, only went because his overbearing mother would of beat the crap out of him and turn him out of the house if he did not go. As he is scanning the company's hit novel for interview prep, lo and behold a Zel pops out.
I would then have the Zel provide his dissatisfaction in a humorous embarrassing way resulting in Hotaka blowing the interviewer away by providing the answer for the author's writer block that was preventing book 2 of their only hit novel.
In this way you establish that the protagonist is pathetic and give yourself some direction. He is pathetic because he is lazy and a coward w/o ambition. You also give the reason why he impressed enough to get the job and establish the existence of the Zel.
My impression from your post is that you want to write something but you are stuck on the idea and arcs, but have missed filling in your characters bios and motivations which ultimately gives the nitty gritty for your story direction.
I took your depression/loner/untrustworthy character desire and tried to think of what would make a person like that. That is how I came up with the starting idea. Since a character like that would be useless for most jobs, he needs some convincing reason to land it. (I answered the somehow he has a job to start the story) What naturally follows with the idea that he met a Zel making him of value to the company in the form of solving writers block for volume 2 of a hit novel. The best friends engagement was just to establish the protagonist as pathetic and possibly provide a thread for a future direction. As for the novel belonging to her father, another possible future direction.
A story is more than an outline arcs- it is the characters that make it. Start to outline your protagonist ( how they act and react, how they are feeling, parents, motivations, backstory etc). Give it enough detail to have a history like a real person but not so much depth that you lose yourself in it and don't write.
Once you got that, just start putting the scenes together. As you put the scenes together, continue to outline the people who your protagonists interact with to give the scenes direction. (Currently your outlines of his coworkers are shallow probably contributing to your writers block). With these histories in the back of your mind, the scenes to write should naturally pop in your head.
You may find that when you start writing, your outlined goes into a totally different direction because your original direction does not fit the character. That's okay. Sit back and reforcast.
