Is there a novel ??

Yes

Yes here are links if you’re interested!
Novelbin - https://novelbin.com/b/eighteens-bed/chapter-105
This starts from where chapter 43 starts. Please note novelbin sometimes has missing chapters.

Novelupdates - https://www.novelupdates.com/series/eighteens-bed/?pg=1#myTable
Please start from chapter 10.5. Also, if you want to use novelupdates, you need to set up an account. Don't worry, it isn't too hard to set one up.

Enjoy! ╮(￣▽￣)╭