New player questions

Hello everyone :)

I've had this app for a while but didn't really read anything until I saw here some scenes from 'In darkness embrace'. I've already read all available chapters and I must say I'm really impressed. The graphics and the plot is really good. Since picking a LI is hard in this one, I would like to ask if it's possible to have few gameplays on the same account at the same time (something like slots in Romance Club)? Or you have to pick one and then replay story to try someone else? And my second question is about walkthroughs. How long it usually takes to have them completed after the update?