The first 70 or so chapters are very hard to read. Chapter 71 is about the turning point where the series becomes a bit more about Tomoko interacting with people.
Definitely Adult Life! The title translates to "A little further in the story" and the commentary translates to "Cohabiting......!!" (translation courtesy of Danbooru)
No guys, you're reading this wrong. This is Nozomi and Eli bragging about their mutual girlfriend. Because the three are dating and I won't take it otherwise