thank you so much for the praise :D Yes, as you said there are otome games about Diabolik lovers. In fact the series started with the CDs and the Otome game... I Made the GUi so it matched the Gui of the newer games.
When it comes to Kou... I will add a few flirty scenes with him in the Azusa and Yuma route but not a route, sorry :C At this point I need to focus on the 4 (5 if I decide to add Laito) routes.