No. The second chapter came out in the very last issue of Hirari magazine.
Edit: Also, this was re-released in a collection by this author, called 妹ができました (Imouto ga dekimashita/I got myself a little sister), and there are only these two chapters there. It's completed.
awwww that is really sad. I want at least an extra or something.
is there going to be chapter 3? Man this is really good. Frustrating in the beginning (relatable frustration) but with a really sweet ending. I like how it didn't prolong my agony with the love triangle.