The first 8 through 10 chapters have progression: it's a very common setup: male p.o.v. character is enchanted by the sight of a cute female on the way to school; turns out said cute female shares a class with the former and then just without any shame says that — though being fully aware of looking like a female — is in fact male as well.
The first couple of chapters are somewhat interesting and philosophical about this and flaunt the idea that there is absolutely no evidence of his being male except for A) his own word, and B) his delicious, flat chest, neither of which of course amounting to any absolute proof. Our trap himself acknowledges this and is initially quite philosophical and teasing about this, pointing out the absurdity of others even caring and what difference it would make. Our trap is flirty with the p.o.v. character, casually sexually harasses him and teases him, and they grow closer together and regularly have sleepovers and become very good friends.
And after that it just turns to a slice-of-life series where they "do stuff"; the dangling quæstion whether Kizuna is actually male or just thinks it's funny to claim to be to get under the skin of others and the philosophical implications thereof is dropped eventually and the character is just assumed to be male, at one point even flipping out a student i.d. to prove it which they could have asked for easily in the beginning for proof.
The problem at this point is that it's not funny; the plot isn't interesting; it's not cute either; it's just ship-tease with no end to it. They don't grow closer together at this point any more; there's no progression and the series continues to rehash the same joke that Maki and Kizuna "look like a couple" and we basically have a "bromance" going on with Kizuna being more flirty than Maki.
And then at the end it's just resolved in a way it could have been resolved at any point; the author just decided "It's time to end it." and wrote the final couple of chapters where it is resolved.
Now there are definitely some plus points: The perspective character is not "totally average" but actually has some character definition, being basically good at everything. He's an academic and athletic prodigy; he's apparently very good looking and has a lot of admirers but had only one past love that choose one of his best friends over him that's a female that is self-described only interested in females, and in the m.c. as well ("I like girls because there are no other males like Maki" )— personally wise however, he is super bland.
I say "apparently very good looking" because I can't see it; the art isn't that good and fails to properly translate the supposed good looks of many of the characters.
The final chapters where there is a resolution and conclusion is definitely endearing and the earlier chapters are interesting; there are some really endearing moments between them as well — but there is just too much filler about nothing without progressing the series and the art isn't that good.
