Searching for "imouto" returns strange results. Maybe be leftover data from a removed manga?

The series and chapters were removed, but the volume designations remained (since I didn't expect it to do this lol). Definitely leftover stuff. Problem is that the 4 volumes are actually supposedly to be removed (can't be accessed by the admin panel). So it's a database issue. Just ignore it for now, probably will be fixed post migration.

What happened to get it removed?