Fumi ni Jirareta Junketsu Otome no Hanazono ~Hanatsumibito Rakka~

Mayuko and Saori are surrounded the beauty of the flowers in full bloom at Saint Agnes. No one else knew the other masks they both wore. That was until he, Rakka, appeared.
At his hands the 1000 year kingdom of maidens slowly started to unravel.

[From DLsite English]