Why only one yuri route?

So I've been wondering how to trigger manuel's bonus route. I've done all main routes and main endings (in visual mode). So my guess is that it can only be unlocked while playing easy or normal mode? Anyway if someone could give me a hint that would be great. ps: I've tried spamming the text under the achievement in-game but it only makes the game crash......

But Man are those ratings bad.. and only 1 Yuri route just killed it for me. Come on Winter Wolves, get that mojo back.

I'm sorry, but an uncaught exception occurred. While running game code: File "game/plot/gameflow.rpy", line 1412, in script call File "game/plot/gameflow.rpy", line 1316, in script call File "game/plot/gameflow.rpy", line 1316, in script call File "game/plot/gameflow.rpy", line 1316, in script call File "game/plot/gameflow.rpy", line 981, in script call File "game/plot/gameflow.rpy", line 981, in script call File "game/plot/gameflow.rpy", line 981, in script call File "game/plot/gam...

Time shouldn't pass just because you want to look at the status screen.