It's not axed because the story progress, stop saying random things.
I know some people here read too much of crap rom-com with nothing happening for 100 or 200 chapters, but this story still can go for a long time.
Author comment for the end of this chapter is :
The slogan of this manga has been "A love comedy about blood related siblings, overflowing with sadness" from the beginning... I hope that everyone that has read this far keeps accompanying us!!
After talking it out with these (shitty) "friends", the next huge step will be their parents.
And the next one will be how they would do the marriage. Etc.