Riri and Minato are very likable. She is energetic and hard-working, she faces everything head on! Minato is the aloof, but gentle type that is in most shoujo. But, he is also very mature and respectful. They make a lovely pair. One of the best manga couples! Riri shocked me because she was so easily embarrassed, but she became a woman in the last chapter. Oh-hohoho!
The side characters are also great... except for Aoi. She cried way too much. Serina was also annoying at first, but gets better once she gives up. But, Rui, Saiki, Kozumi, etc. were lovely.
Hata and Tawa were also a great pairing. I've seen people hating on Tawa cause she is possessive and lashes out. But, I understand her. She was afraid of things changing and growing up. She didn't want Riri to have a boyfriend or for Hata to "confuse" her by confessing. Tawa was always in love with him, but afraid of moving forward. Hate is a gentle giant, patient and sweet with her dramatics, LOL. I wish we could've seen more of them.
The slice-of-life chapters are the best, IMO. Like the babysitting Kozum's sister or when Rui found the cat or vacationing during the summer. Also loved all the Tawa/Hata chapters.