Hidden Questtt!!

First time cleared with just 20 mins to spare. This time, cleared 24 hours before the deadline. Thank goodness~! Auto-battle rewards, sweep, hooray 🙌 I'm stuck though, and the additional hidden quests are until rank 70 in 31 days?! Since I can't win... if only the rewards are good... I'll do it like before. Lose the battle, get the rewards, sweep... Should I try? While thinking that, I'll retire if it seems impossible. I might spend money, so I want to withdraw early. Because all the characters are cute and the sound is beautiful, it's tough (´-`).｡oO