Yeah. Some really good stuff here. The biggest value I've noted in the manga is the shifting character styles (like those goofy chibis) and expressions, as well as these little glimpses at his middle school days showing there was a connection between him and Lemon, but he just refuses to acknowledge his middle school days at all, it seems.
Though, to be honest, I also appreciate the anime's consistency of character design. I just wish it had more of these glimpses back into his past that he clearly refuses to admit happened, and a bit more expressiveness overall. I'll still insist the opening moments of the anime were far better than the opening moments of the manga, though. The whole sequence with Anna (I suppose also the opening narrative about the very premise of the series, too) was just so much better done in the anime, it feels like. But the manga has had an opportunity to see what the anime has done and improve on it with a number of the chapters since then, too.
Nukumizu in general is so committed to seeing himself as a 'mob character' that only exists to fill in the background, when he really is the star and many characters are showing interest in him because they can tell he cares more than he lets on. That 'mob character' mentality causes him to downplay how strongly he feels for these characters. 'Not a big deal' my ass- you just didn't want to say the 'can't help but root for you' thing, because it breaks from that self-perception you are going to probably be struggling to break for most of the story.
And folks are saying he's gotta end up with Lemon, but, to be honest, he has these sorts of moments with all three of the girls we've met so far, though some of them are yet to come to pass. It's just he's got more (un-acknowledged) history with Lemon. I personally think, as someone who watched the anime, he has more of a connection with Anna, despite the history with Lemon. Especially the way he almost always interacts with Anna alongside whichever other character the arc is focusing on, so even if he's getting closer to Lemon, or later Chika, he's also getting closer to Anna in the process, generally.
Not saying I'd prefer him to end up with her, just noting much of the evidence I've witnessed feels like it leans heavily towards Anna, regardless of any middle-school history with Lemon. I don't generally 'ship' so much as acknowledge the leanings implied. Have similar experiences reading or watching other harem or pseudo-harem works. Like Nisekoi, especially after watching the anime and then moving on to the manga through about the first hundred chapters, the main love triangle, and where things were pointed, felt pretty apparent to me, especially as one of the triangle's progress often felt stagnant and even retrograde at times, while the other was almost always progressing forward, regardless of how much of a 'penalty' they started with. One of them clearly had more 'history' with the male lead, but that mattered little when she barely spent enough time with him, on or off panel/screen, compared to the other one.