There is no trick outside of buying kobans for 10x roulette... It's easy to get many over time though, just stay patient and don't miss any fights by letting the energy cap... I set an alarm clock for it so I never miss any, but if that's too much for you then you can just do as many as you can.
I have work, so I can't play the game all the time
just when I get home and play my main games, I do Harem Heroes at the same time since it doesn't lag browsers
If I play Raven and KamiHime, lags
If I player Floewr Girl and X-overd, lags
Harem Heroes works out for me as it's not my main game
Nutaku: July 2016 | Flower Knight Girl: 835228859 | DMM: 646263953 飢えたハンター
Plays Flower Knight Girl, Aigis, Kamihime
Dropped Harem Heroes. Staff deleted my nice reason for not spending $.
Signature made by Myrdin