I don't know if it relates to this at all, but when I was reading I thought it meant that Kai-san can become invisible
But after reading your message I thought also how Kai-san disappeared once for like a month or so, but to him it didn't seem such a long time
If you didn't say anything, I personally wouldn't pay it much attention at all! Translation overall made sense and was easy to read, so thank you so much for your work!

Hey guys I had a bit of difficulty with one section in particular and I wanted to clarify it since I went with what made the most sense but not exactly the most accurate. On the page with Asuka-kun thinking of all the attributes of Kai-san it has a chibi Kai-san saying “I can physically disappear ☆” but in the raws it says “物理なら離れる★” which I used 15 different translators and they all said something like
1. In terms of physics, it moves away.
2. If it's physics, Leave
3. If it's physical, keep your distance
4. If it's physics Distance away
5. If it's physics, then it's about moving away
6. If it's physical, stay away
And I considered using #6 but it still didn’t make sense cause he never told Asuka-kun to stay away from him and he’s actually pretty clingy still and I’m sure if he was warning Asuka-kun then the chibi expression would be serious maybe?
I have no idea but I hope you understood the conversation regardless