☆☆☆ Hard Fastest (2020-05-25) ☆☆☆

This takes 13 turns. Info is from しろくろ's Twitter.

1. ★6 Freesia+15 (Wave 2: Kill 9, 10, 4, 7, 2)
2. ★6 Shoman+15 (Wave 2: Kill 1, 5, 8, 3, 6)
3. ★6 Christina+15 (Wave 1: Kill 8, 10, 3)
4. ★6 Lian+10 (Wave 1: Kill 11, 6, 9, 5, 8)
5. ★6 Cecilia+15 (Tanking the boss)
6. ★6 Jin+10　(Wave 1: Kill 2, 4, 7 by counter)
7. ★6 Helga+12
8. To be killed

☆☆☆ Hard Flexible (2020-01-10) ☆☆☆

100%, and you can use this as it is even when somebody starts the fight first or joining someone else's fight. This takes 22 turns. Require Granhildr+15. The front 4 are there to be killed by 2, so that Eindolin will increase her support power. All enemies who attack Granhildr except Dolan should be kill by reflection.

1. ★6 Refithea+12
2. ★6 Chalkle+10 (Wave 2: Kill 8, 2, 1)
3. ★6 Eindolin+10
4. ★6 Granhildr+15
5. ★6 Lian+10 (Wave 1: Kill 11, 6, 9, 5, 8)
6. Others are all to be killed

☆☆☆ Hard (2019-12-08) ☆☆☆

100%, and you can use this as it is even when somebody starts the fight first or joining someone else's fight. This takes 26 turns. Granhildr+10 and Refithea+12 combo can do just about enough reflection to kill mobs.

1. ★6 Refithea+12
2. ★6 Mary+10
3. ★6 Chalkle+10 (Wave 2: Kill 8, 2, 1)
4. ★6 Helena+10
5. ★6 Eindolin+10
6. ★6 Granhildr+14
7. ★6 Lian+10 (Wave 1: Kill 11, 6, 9, 5, 8)
8. To be killed
9. To be killed

☆☆☆ Normal (2018-10-29) ☆☆☆

There is a good possibility to clear all.  Using 3 tanks, but Grosa, and Granhildr are main tanks, and Seir is more like backup.  Garinoth will hit 4 on Wave 1, and he will do good damage.  In result it will get much easier after that.

1. ★6 Anais+9
2. ★6 Grosa+9
3. ★6 Vincent+9
4. ★5 Garinoth+1
5. ★6 Seir+8
6. ★6 Veronia+9
7. ★6 Viola+9
8. ★6 Elizabeth+0
9. ★6 Granhildr+3

☆☆☆ Normal (2018-10-05) ☆☆☆

At this moment, I use this formation.  With this I can go around 85% in normal.

1. ★5 Eunice+9
2. ★6 Grosa+9
3. ★5 Vincent+9
4. ★6 Rafina+9
5. ★6 Veronia+9
6. ★6 Viola+9
7. ★6 Anais+9
8. ★6 Astrid+6
9. ★6 Angelica+3

Tip from YouTuber チャンネルハックン.