Ghost, you may kill boss with 1 RP too in near future.
All girls in Spring Garden are supporting you, even they not in your roster.

Thanks the miss buff + Full power Yamabuki I can knock it with 1 point, finally.
(I completely forgot we can use more than 1 RP to hit boss).

To think that I almost quit this game because I draw 11 3* in June Bride event last year.
I come very far.