Blue Archive JP Total Assault S64 Indoors Perorodzilla INS 27.6M

Funny thing, I saw that Iroha/Ibuki was used in insane difficulty as top strat while I was away from home, and I was really eager to try it when I got back home, I forgot to record it.
So I went right back to mock battle to get a footage, I couldn't get it at all. I even had to change skill timings, too. I don't even remember what I did the first time anymore. But I was able to get this run, finally.
Anyway, you can try different timings. This is just what worked for me. The important bit is to get Iroha's basic skill to hit twice during the dps phase with the buffs active, and get good crits leading upto that.
Now, time to grind torment difficulty...