I still see people complain about arguably the easiest boss ingame.
The rule is simple, If you have Summer Hanako, minimum required level to clear is 40
if you dont have her, minimum required would be 44-45 depending upon your efficiency, RNG etc.
Team Reccomended:-
Strikers: Single Target Mystic Attack, One tank, Summer hanako(if you dont have her use a yellow striker), Mystic AOE
Special: Ako(can use serina instead), AOE
What I used:
strikers: Wakamo(With bond gear), Shanako, Yuuka, Koharu
special: Minori, Ako