Did I translate this right?
The dialogue makes no sense to me...

If I had to guess, there's a previous page we're missing.

There are some strips that have Kyon talking with Disappearance Koizumi, but nothing that indicates that it's any sort of prelude to this.

How very strange.

LordAnubis said:
If I had to guess, there's a previous page we're missing.

Yeah, I thought there might be too, but I didn't see anything else related on the artist's pixiv page. The image description didn't have any useful information either, other than "Spoiler" and "Sorry for the blood."

Perhaps it's something to do within the context of the movie. Then again, I guess it could just be crazy rantings.

a c-can of tuna
along with some toast