I am a collector and I have read over 400 manga series since I got into manga 11 years ago. It takes a lot for me to drop a series since I have made it through reading absolute garabage before. I have however dropped a lot of manga; some I picked back up and are now treasured favorites and others have become long forgotten since I never kept track ......
Dropped 'Oni to Tengoku' lots of people may disagree with me (as it was incredibly popular) but it was far too rapey and manipulative. The seme was far too annoyingly egoistic (really???? just because you didn't get love as a child you fucking touch children and anyone that comes your way? yikes) And the uke was far too accepting. You just got fuck......
Carrier falcon Princess