There is quite a number of heated comments, mainly about the (rushed/unsatisfactory/something worse) ending. Considering the little soliloquies about empathy multitude of opinions happily existing together... it is slightly ironic.
Yeah, I would love to see the whole process - their university/working life, changing of perspectives as they age etc. but as was said before me, the main theme/idea of this manga was something else (however oversimplified) and for that this kind of abbreviation was a suitable solution (not to mention a common plot device in this genre).
I appreciate this manga for the sweet atmosphere, for the lack of melodrama, for (more or less) believable characters whose behaviours and personalities are within the range of teenagers. It deals with various themes and topics that are at least difficult to address even if they´re rather normal part of growing up - insecurities about your self-worth, orientation, identity, future, love-interests etc. Their attitudes are for the most part very believable and the author tried not to dismiss any of it and give space and value even to Kensuke and his attitudes toward male homosexuality, women, genders or roles in relationship. Of course, with so many themes, not each s handled to the same extent or as good as others. Given the length of the manga, it can be understood. Unfortunately, it suffers (not always but it is still present) from the school-romance genre curse - "love this, love that! while other aspects of their lives - such as parents, friends, school, future job or themselves get to play the second (or twentieth fiddle, based on the topic).
Overall, it is not the best of what high school coming of age stories can offer (I would recommend Endou-kun no Kansatsu Nikki, Mustard Chocolate, Nostradamus Love, Mikako-san, Tetsugaku Letra or Cocoon) , nevertheless it is good, sweet, understandable and relatable, even if the premise is rather simple and the tone sometimes too didactic (some of the dialogues sound like taken out from educational brochures). There is also the whole silliness with happiness being the meaning of life that gets on my nerves quite a lot (but well, i guess this bandwagon is really hard to avoid in this genre, huh?)
I would recommend this as a nice lighthearted story about growing up that does not avoid less mainstream and bubbly aspects of youth and that will not make you angry with unnecessary melodrama, stereotypical and unrealistic portrayal of characters and situations which loads of school life mangas suffer from.
sorry for the long comment.