With the Romanceable characters is it going to be choice driven or linear story. Right now he seems to only have eyes for the noble woman even with the herbalist being there despite the past they share.
Maria is the main LI, so she's mandatory. Whether you attempt to romance other characters as well is up to you. I can guarantee that there will be at least two good endings (Maria-only and harem), but achieving the latter ending will take some work, since Maria isn't the sharing type...
