The New Gate
KishiYu in The New Gate (anime) setting
Yuder is Kishiar's subordinate and Kishiar almost doesn't want to go home because 1) he loves Yuder and 2) Yuder would be sad to see him go.
Debating on whether Yuder is an Elementail (High leveled Fox Monster that Kishiar gets tamed as a subordinate in a game event) or the Half-Dragon species.
Leaning more on Elementail because I love foxes and that would make Yuder genderfluid because Yuzuha is - and I just adore Yuder transforming into both guy and girl depending on his whim. Like he doesn't even give it a thought. Meanwhile, everyone watching him just loves both because Yuder's so handsome/adorable depending on which
Anyways, Kishiar leaves Yuder behind to beat the game and go home, knowing that Keilusa is worried for him. Although Kishiar's body is sick and weak IRL, Kishiar wants Keilusa to know that he is okay even if he might die the next day because of his IRL health.
Yuder goes with whatever Kishiar wants and doesn't say anything as he watches Kishiar go.
Kishiar beats the last boss and then the gate opens and he finds himself in the game world. Like the anime, 500 years have passed.
Kishiar goes to Cavalry Headquarters and finds Yuder who is happy to see him. Hugs. Kishiar asks about the world; Yuder tells Kishiar everything including how other High Humans (players) are here. Yuder had been trying to hunt down all the PK-ers and demons he can find. Also, find and take care of Kishiar's friends.
Kishiar is happy and thanks him. Yuder's fox tails pop out and wag.
They get ready to leave and go on an adventure, but before that the observers of the kingdom that had set up near the Cavalry HQ 500 years ago to indirectly get Yuder's protection try stopping them. Yuder considers killing them, but Kishiar pats his head and says he wanted to find out more about the kingdom and get a Guild License anyways.
Yuder switches to female form to cling onto Kishiar's arm and deter anyone from proposing to him. Kishiar is a little stunned and amused, but he then understands Yuder's feelings because Yuder warns him that the kingdom's people are always trying to propose marriage to strong people for their blood lineages; Yuder himself is always proposed to by both guys and girls because no one knows what he is (but they don't know he's actually 'a monster', they just think that he is always hiding his form through high level magic). Kishiar doesn't like that, especially the thought that Yuder might have accepted one proposal in the 500 years Yuder lived without him.
Kishiar draws Yuder closer to him, surprising Yuder but making him happy.
Kishiar doesn't hide who he is, especially when king tries to claim Yuder as theirs to keep the strongest person in the world with them.
After establishing details (Yuder and Cavalry HQ building is his; they have no relationship with the kingdom), Kishiar goes to get his Guild License (for fun, he doesn't really need it) and then goes on an adventure with Yuder, having fun, getting closer to Yuder now that this was reality, and finding his friends/allies while defeating the enemies.