I think it's an extra not a new volume. But anyways I want more!!!

It’s a new volume.
https://www.yesasia.com/global/k-sensei-no-renai-na-nichijou/1067175685-0-0-0-en/info.html

I know there is a vol 5 but is this from it

Scroll down for the free sample.
https://renta.papy.co.jp/renta/sc/frm/item/159960/

O ok ty