I'm lazy and using my farming team (Cellia for rainbow fairy boost), which is noticeably lacking in ranged magic.

I just used Elizabeth/Nanaly to nuke the middle, and Berna to take on the Ushi-Oni. But Berna can get two-shot if Nurarihyon is still alive, if Iris' skill isn't on, and if dodge RNG just doesn't kick in. Learned that the hard way, even though all three happening at once on a semi-afk run isn't all that probable. And if the Ushi-Oni doesn't die quickly, Elizabeth is distracted for too long, and the Nurarihyon starts moving... Things get a mess from there.

So I learned to just use Elizabeth and Nanaly's skills early to DPS them out of the picture. Makes the rest of the map a cakewalk, though I still occasionally forget to put Noel down in time, so the kamaitachi survive with some health left by the time the red ogres and tengu spawn, which also causes issues.