オープニングナンバーでしょう
ōpuningunambādeshō
1. Probably the opening number.; Likely the opening number.
Noun
#259408
1. Probably the opening number.; Likely the opening number.
1. number
2. number plate; license plate
1. opening; start
2. opening credits; title sequence
3. theme song (played during the opening credits of a TV show, etc.)
1. number one
1. number plate; license plate
1. it seems; I think
2. right?; don't you agree?
1. Number one; Best
1. If number one; When number one
1. Number one; Best
1. Probably number one.; Most likely the best.