After recruit some people in the Main game a side chapter should start. You have control of Rita, simply press:
(C,
and
are the Piko Hammer atack button.)
Keyboard:
C + ↓(hold) + C + C + C + C.
Xbox controller:
+
(hold) +
+
+
+
.
or
+
(hold) +
+
+
+
.