I was asked to look up how well Osawari Island does on dmm's site.
I got then curious and looked all games up that we got so far on the .net site.
And here it is:
#02: Millenium War Aigis
#04: Dragon Providence
#13: Lord of Valkyrie
#14: Peropero Seduction
#22: Dragon Tactic: Memories
#28: Osawari Island
#49: Girls Kingdom

Now I'm interested of what you lot think of that popularity ranking. I must say I'm surprised that GK is lower ranked than OI, where on our side OI gets quite lot of complaining. (Well PPS even more, but I need to remind that Japan didn't have such severe bugs or the medal shop)

P.S.: Angelic Saga is not listed because dmm stoped hosting it, but nutaku themselves are still supporting the developers.