Honestly im not a master in this game (dnt care as long i have fun :D) but so far i made this event with this team
Attachment 4077
pretty well. It could be better but i dnt need a 100% completion. My progress so far:
Attachment 4078
Note: I didnt used Nagi at moment cuz Hina has atm better stats as Nagi due 100% Affection. Also ALL of my chars is Level 30 or below 30 (except Nagi and 1 or 2 another chars).