Kay guys, it's one real development right there. I don't know what you guys might think of it, but there's more in it.
Let's talk about each of the girls, from the youngest to the oldest. First, Itsuki is a glutton just as always. Despite being the first heroine appeared, her show time is rare and her development is slower than a snail. However, the fact that she is in a complete tune with Fuutarou might bring an unexpected sudden turn.
Second, Yotsuba the uselessly energetic girl. She's one hell of a jack-in-the-box. She's all smile and easy-going, but you'd never know what's actually going inside her head. Well, maybe there really isn't anything going in there. As the unknown factor in the harem, her role is to restore everything to the original status. She might be the most dangerous girl in here, so be careful!
Third, Sengoku maniac Miku. Everybody loves Miku, as she is the first decent heroine ever appeared. Miku's the most matured heroine in here, as she was the first girl ever to develop. I can't say much about her, you guys know her more than I do. One thing that you have to take a note for, is that Miku agreed for the Harem.
Fourth, Nino, our current most dazzling star. The dark horse of trojan, though it seems like she prefers a white horse instead. A prideful girl who won't let herself lose to the trope. You can't relax your guard against her, expect more sudden attacks in the future.
Lastly, our beloved problem child, the oldest girl around, Ichika. Ichika is troubled. Yes, she's very much troubled. As the oldest, she places herself as the one who gives up and gives in. She loves Fuutarou, but she also thinks that she has to give up for Miku. She can't be honest, she cursed herself to not to. As the oldest, she has to be the one who provides everything for her little sisters. She has to be selfless. Thus, she continues to hurt herself. Again and again and again. What Ichika needs is something that will drive her to pursue her own happiness, and the current chapter is a great example of it. She knows Miku loves the man she loves, and she believes that giving up for Miku is the best option, but after she saw Nino's confession, that mindset cannot be there for long. Because even if she did give up, Nino and Miku would still fight over him, and she couldn't choose for whom she would support. Ichika has to know that she is allowed to love Fuutarou as well.
Long story short, we're heading for the Harem route!
TL;DR in the bold