Libromancers rely on having ritual monsters in hand to function
Nekroz and Mikanko ritual monsters are both a semi 1 hand starter hence this is one of the best ways to utilize rituals with less chances of bricking
Choju is a godsent support for rituals allowing the search of any ritual monster and spell. the only downside is its a normal summon but since none of libromancer nekroz and mikanko technically need their normal summon Choju is a option.
Of course there is diviner but you cant search 2 without using going through the Exa-bettle line and then youll need another lvl6 for that too, which is one of doombroker/agent/ohime and I personally dislike the Archlord floodgate or Baronne in every deck idea :x
Choju is bascially like junk speeder for rituals.
Because the deck has many ways to start it can bait out some hand traps and negates. but overall the deck isnt very good but fun enough to play.
Feel free to leave feed back and suggestions :D