So after reading this in English I do have some different views after all these years.

I learned that the Japanese Judicial system and their views on murder is very black and white. Even though the teacher raped and blackmailed Yui and deserved to die, the law would still be against her. To top it off the public would try to changed the narrative by saying it was a consenting relationship. Takashi chose to admit to the murder because he loved Yui and wanted to protect her, and because their society would be against her. Looking back at this story made me realize that as much as I think Yui should've confessed and Takashi shouldn't have taken the fall, I get why it happened. But as the story progressed they both realized the real suffering they caused to themselves and others and that's why not only the the truth need to be told but the had to move forward and never see each other again. The teacher's son wanted revenge, but he also had to face the truth about his father's sin after find the USB drive. In the end the truth was told and Takashi and Yui went with the separate lives and found strength in the support of those around them. I think this story is excellent like the creator other works. The story can get painful and you can get frustrated with it's cast, but it's worth reading for the character growth, relatable commentary, and great ending. I highly recommend the author's other works as well.