Sorry,Youth Log 4 is not avaiable yet. We will update Youth Log as soon as it is released.
If you want to read new chapter of Youth Log at the first time,you can subscribe it. We’ll send your the email as soon as Youth Log 4 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