Sorry,Underdog 18 is not avaiable yet. We will update Underdog as soon as it is released.
If you want to read new chapter of Underdog at the first time,you can subscribe it. We’ll send your the email as soon as Underdog 18 updates.

Have more fun on facebook:

https://www.facebook.com/mangahomelife/

Or enjoy fantasy shoujo moments on tumblr:

https://onlyshoujo.tumblr.com/

You can read some other great manga to kill time