@blablablahhjkl I honestly cannot remember. The setup was fairly similar to this one, showing how bland manga can be.
MC is black-haired and has cat-ears like hair. He and at least one "blond" (male) friend are sent to another world/isekai that's the standard vaguely medieval European settings. The princess is a jerk. She thinks that the blond friend must be the true hero, and she wants to get rid of the black-haired MC. The blond friend is kept in the dark about how much of a jerk the princess is while the MC basically gets kicked out.
Surprise, surprise, the MC is the true hero and meets up with...I want to say the sister of the princess? That part may be wrong. And the MC possibly fights with an umbrella.
I know that the story is explicitly not very old because one page had a comment about how the Japanese imperial era changed to Reiwa during the story. I'm sure that was definitely before chapter 20, so that means it was early on in the series when 1 May 2019 came around.
Like I said, I can't remember too much about it. They all kind of blend together. The MC punching the princess was not even a big part of it all.