Overall: 9/10
art: 8/10
characters: 8/10
plot: 9/10

SPOILERS BELOW
How do I start my text? differently! talking about quintuplets in order.
Ichika the "1st to like" Fuutarou and also the one that in my view did the most shit since pretending to be Miku, lying about the past among other things, in the end she ends up redeeming herself for her actions and achieving friendship do Fuutarou back, but it is to be expected that Fuutarou did not choose her, as he never felt affection for her beyond all the bad things she did to him and Miku.
Nino the "revolt" is the only one who always hated the presence of Fuutarou (because he did not want him to destroy the friendship of the quintuplets) and the study group, after an incident with Fuutarou's fake cousin who was Fuutarou himself, Nino begins to like Fuutarou (which until today I can’t accept, because for me it was very NOTHING) and imposes both for Fuutarou and for the other sisters who like him and who will face everyone on the way between her and him, Fuutarou he always had intrigues with Nino and with her strong personality, probably between 5 she would be the least likely to be with him in the end.
Miku the "goddess" of the work (yes she is my favorite) the 2nd who starts to like Fuutarou, but too shy to do anything to bring the relationship with Fuutarou even with the help of Ichika and the other sisters, but never she gave up going after him and with Nino's affront she started to be more active, but as we can see she didn't get the love she wanted.
Yotsuba the "fool" who never showed any affection for Fuutarou, but theoretically is the "0º" to like him, because she was the friend of the past that changed Fuutarou's whole life, Yotsuba has always liked Fuutarou since she discovered he was the boy from the past that she had known, in my view is the most developed in the personal and psychological part with all the guilt she had imposed on herself because of the school grades and the sisters, which with the help of Fuutarou and the sisters managed to win this psychological problem and move forward with your declaration of love to Fuutarou which was answered in a positive way as they started dating (even though they were two living doors).
Itsuki, the "glutton" who met Fuutarou at the beginning of the manga and is already rejected when he asks for help in his studies and when he discovers that he will be the private teacher, he has a foot in the back, Itsuki I have never quite understood what was happening in his head since Rena's creation, her love for Fuutarou and her mother's equal profession, but even with all that, she evolved in relation to her profession with the "biological father" "suddenly added to the plot (which will always be strange and a little hurry) as a "villain" that only serves to harm her, and that Fuutarou and her adoptive father stand out, but the important thing is that, in the end, she resolves herself in what she wants life and that she will not regret the choose, to love or not to love Fuutarou, I still have doubts about it today, because she is the only one who doesn’t really like Fuutarou, although there are some scenes (like when the two are hiding in the room, listening to Yotsuba and Nino talking and Itsuki will not let him see the phone screen, because the wallpaper is the two and Raiha) that show the opposite is still subjective to what she feels for him.
Well, the final chapter is a beautiful wedding with a small set of quintuplets closing the development of each of the sisters, confirming that the girl with the bell kiss was Yotsuba and ending with a ... Honeymoon harem? these quintuplets in

my english is bad sorry