Bokura No Shikisai (Our Colors), Chapter 2
Monthly Action June 2018 issue, April 25 2018 on sale

Bokura No Shikisai (Our Colors), Chapter 3
Monthly Action July 2018 issue, May 25 2018 on sale

Paper book

Kindle

I’m not sure that it’s possible to access from outside Japan, but now Chapter 2 is free to read on the web until June 24. Click the pucture below.

And Chapter 1 is also permanently free to read on same page. Click the thumb on the same page.