My Stepmom's Daughter Is My Ex: Volume 6

Now that things have gone back to normal with Isana, I can finally focus on the thing that’s been on my mind—that kiss. What the heck is going on with that girl?! Why would she do that? There’s no way she actually has feelings for me...right? We broke up. We’re stepsiblings...though I guess you could call us stepexes. What am I going to do? What do I even want? Looking at her, she seems different than the girl I dated. But have I changed at all? There were so many things I should have said to her back then. So many things I should have done. Things could have—should have—turned out differently. But it’s too late for “would’ve, could’ve, should’ve.” Well, now that we’ve both been nominated for the festival committee by our class, we’re going to spend even more time together than usual. And a cultural festival is the perfect event to find out what’s what.

[From J-Novel Club]