I think you're thinking about it the wrong way round. 10 years fantasy time equates to 3 months our time. He was in the fantasy world for 5 years, equating to 1.5 months our time. So when he went back home only a month and a half had passed (if the differences in the flow of time are constant)
You might be right. But I still feel something is off.
True, it's a bit weird that he could go back to his life like no one noticed he was gone
He was an orphan with no friends and no real connections so i think that made it somewhat realistic? I would imagine though if he suddenly fell through a portal during work times someone may have reported him missing?
Probably it's because even his wounds that he obtained in that other world are gone. Meaning that when he said he came back to the same PLACE and TIME could also mean that its as if he never went to that world. (He could have returned on the time before he fell into that portal in the 1st place.)
Since there is no magic in our place. Time would pass normally for him. (No time skips)
It took Mel 10 years of his time to able to reach Yuta's time line that has passed 3 months.
Oh wow, that makes it all make sense! That means Yuta aged down and lost those 5 years or so he was there. Oh god what would happen if Mel died of old age and then a portal opened and took an old Yuta back and he became young again! That's is so cool but awful at the same time. I mean I'm sure someone by then could bring him back but he'd have to live a young life with out his husband. I've made myself sad.
Yeah that would be sad. Especially what if Mel couldn't make it to open that portal? Yuta would have never know if Mel died in that other world.
So glad that Mel only aged 10 rather than a 100 ^^"
If time means anything then when Yuta went back home then 200 years should have past in our world. Ten years to pass in three months our time, that's 3.33 years their time a month. He was there for 5 years, thus doing the math it's 200. So Time is a weird mess in this manga.