The mysterious group of five was the St. Omiya Girls High School Railways Club who saw Usagi and others as rivals! And we find out why Nishiki sees Usagi as her enemy.
LAUGH                                                 GIGGLE
قهقهة                                                 ضحك
Hi hi hi
Jajaja
Jajaja
HA HA HA                                HA HA HA
EHEHEH
AHAHAHA
СМЕЁТСЯ                                        ХИХИКАЕТ