Book 1 Slave hasn't changed. Katara appears in Book 3 and has a decent amount of scenes, but it's still focused on Toph. Book 4's love and slave route have drastically different stories compared to the other books. She appears once in Book 4 Slave and has very little to do with the rest of it. She appears a bit more the Love route and has like 2 scenes.She has a decent amount in Book 5 Love epilogue.Only played books 1 and 2 because the slave stuff was super weak a year or two ago. Has it gotten better? Only interested in Katara of the characters tbh so I was super disappointed with book 1's 'slave' route (which was basically the same as it's love route, only with slightly more ropes/gags.) Has book 1 been improved? Or does she make a SIGNIFICANT portion of another book? Thanks!
Personally, I like Book 4 Love Route better than slave, because pretty much all the main girls appear again.