I'm wondering about the guild system. Initially I thought it would basically be "pick the same one as your favourite girl, if you like more than one, make multiple saves". But it seems that the choice doesn't block the main girls nor the side girls (I understand it will be possible to meet the other guild leaders later). Basically what I'm asking is if the idea is to have multiple playthroughs with different guilds (with enough unique content to justify it) or is it more like a single playthrough and the guild choice will be mostly flavour (some dialogue (like the introduction), appearance, combat skills, etc)?