I personally think the hinted plot points at the start (like why would the gyaru accept the confession) were dropped out of the manga. It's been too long and they were never even mentioned after god knows how many chapters. At this point this exists just to be a silly self-insert.
This is simultaneously funny and depressing to read because it is somewhat relatable
also the sister's facial expressions are so sad that i can feel them piercing my soul
This has been going on for waaaay too long already.
It's becoming plainly boring, and the sparse and short chapters make the series feel even more dragged.