No I mean, he only has 3 girls to drop. A low drop rate anyway. Each time you try it's maybe 1%. The more you try doesn't increase the odds. it's just 25 per day, 2 weeks long. 1% each time. I think it's fair considering when you would get those girls. You wouldn't have a need to play anymore.
lol I feel you there I've been farming Dark Lord since day 2 except one day on ninja for 3rd girl. And I hit him for a minimum of 8 times daily. Usually 10 to 12 times I play the game when I'm binging out on netflix so after a episode or movie I'll slap him as much as I can. Rinse repeat. As Greetingz says though it's completely random.
Pero Pero Seduction - Kurzathan 687325
Girls Kingdom - Kurzathan
Kanpani Girl's - Kurzathan
Hitsuji Chronicles - 687325
Flower Knight Girl (Not super active) 833587126
I know how you feel, my luck has been pretty bad also. Still need 4 girls in total and been constantly farming it whenever I get enough stamina to use. Hoping to eventually get them.
It's all luck, I've been doing it nearly every day, multiple times a day for a month. 0 drops.