Iroha clear without Dress Aru, because I don't have her. Instead, I used Camp Hare and switched Himari with Ako. Overall, worse performance which was to be expected but it is enough to clear.
On this boss and using Iroha you need good timings so that her NS and Ibuki's joint skill hit as many ennemies as possible.
00:00 Team composition
00:14 First Phase
02:05 Second Phase
Music used in this video :
207 : • ブルーアーカイブ Blue Archive OST 207. HIGH5LANDER
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