Raid TL;DR

• From INS up, recovery is heavily nerfed.
• Shield and Reposition skills are useful in this raid, making T.Yuuka and S.Shizuko top picks.
• Cover is useful for blocking many of their attacks, making A.Hoshino and D.Tsukuyo top picks as well. Cover supports like Shimiko and Shizuko work here too. Make sure your cover can withstand the damage or else it won't do anything.
• Positioning is crucial in this raid. You may find yourself frequently using an EX, getting the timing and/or location slightly wrong, and watching your student get pinballed into the retreat helicopter.
• Shiro
  • Shiro will throw a couple of balls and then place bombs on the field. For the third one, instead of placing bombs, Shiro will roll 2 balls down 2 of the 3 lanes.
  • On INS, bomb placement is random. On TOR, it's a fixed pattern (oversimplifying, it's +, x, repeat) and there's a sticky bomb that spawns on your front student and stuns on explosion. Some bombs are also ice bombs and will inflict slow.
    • There are permanent bomb safe spots, and some reposition strategies take advantage of them.
  • The rolling balls do massive damage, especially to slowed students. The pattern is Left+Middle, Left+Right, Middle+Right, repeat. They can be blocked by cover and, if the cover does not break (Need 16,500/13,200 HP, double if double ball blocking {Yes, TOR is easier in this sense}), will bounce the ball into Shiro and do some damage and inflict an increased damage taken debuff.
• Kuro
  • Kuro will periodically slow two students, indicated by black feathers hovering over them. They will take massive extra damage from attacks while the slow persists.
    • The extra damage from slow ALSO applies to Kuro. As of now, Airi is the only student capable of inflicting this debuff.
  • Kuro's only attack is throwing objects around in a fixed pattern. Kuro can hit itself, too, and it will inflict a increased damage taken debuff.
    • There are permanent safe spots dotted around the field.