http://www.dlsite.com/maniax/announce/=/product_id/RJ175288.html
Trial available from DLsite. Release date is currently undecided.
Hanataka's DLsite blog:
http://b.dlsite.net/RG07685/
Screenshots:
Heroines:
Serena - Hero's Older Sister
Monica - Feudal Lord's Daughter
Arisa - Inn Hostess...