Ch. 15 - Tournament arc
Ch.39 - start of part 2 (also when oc arrives at Nanba)
Ch. 42 - oc is officially introduced to other members
Ch. 57 - oc meets everyone
Ch. 62 - Jyugo meets elf (oc sees bc of the camera she put on him & goes to see the warden)
Ch. 70 - Start of building 5 arc
Nanbaka