Missing chapters(￣∇￣") Σ(っ°Д °;)っ(╯°Д °)╯╧╧

I only found chapter 77 :
http://mangaseeonline.us/read-online/Online-The-Comic-chapter-77.html

There is a time limit which you can read these chapters:

Chapter 78: 4/7/2017-deadline
http://www.mangabox.me/reader/221/episodes/24201/

Chapter 79: 18/7/2017-deadline
http://www.mangabox.me/reader/221/episodes/24476/

I found ch. 79
http://mangafox.me/manga/online_the_comic/vTBD/c079/2.html

Thank you!