You see, Confessions is a psychological drama, one that deploys fascinating twists that are both unexpected and clearly set up. So for the manga to just give up on the setup and rather than slowly letting reader seep in the sign it instead doing a “well so this now happens” style of “reveal”, to the point where intricate explorations of character psyche throughout multiple chapters in the novel are reduced to essentially being both revealed and concluded on the same page and with none of the depth, that’s a baffling decision.
Not that I can completely blame the mangaka only, the decision to even adapt this into a manga is already weird as the novel consists almost always of internal dialogues of multiple characters giving their views and thoughts on the situation, and that charm just is not going to translate well into a comic. So, what do we get in exchange for breaking the pacing, removing depth, simplifying characters and neutering much of the social commentary? Extremely mediocre art that does not stand out in any way whatsoever and uninspired panelling. There are ways to be creative with manga to tell a story that you can’t do with novels and none of them were utilized there. It failed to deliver on any of the strength of the original in any capacity while also not being able to any new good thing on its own.
In vacuum this manga is not exactly “bad” by itself, but given how it robs you experiencing the novel unspoiled and how it’s just so blatantly bland, I cannot even think of recommending it. If you *really* want to read this, please do so only after you read the novel first. That one is actually good and so well written, I promise.