From this it looks as though it's going to cost US$150
Type of Excess Excess Baggage Charge
(*)Applicable charges in USD will be converted to local currency for the case of departure from countries other than Japan.
Japan, Asia, India, Oceania⇔Hawaii, North/Central/South America, Europe, Middle East, Africa
Extra piece (per piece) 15,000yen(150USD)
Overweight (per piece) more than 23kg ~ 32kg or under:6,000yen(60USD)
more than 32kg ~ 45kg or under:45,000yen(450USD)
Oversize (per piece, total linear dimensions) exceed 203cm:15,000yen(150USD)
Japan⇔Asia, Guam, Oceania
Extra piece (per piece) 10,000yen(100USD)
Overweight (per piece) more than 23kg ~ 32kg or under:6,000yen(60USD)
more than 32kg ~ 45kg or under:30,000yen(300USD)
Oversize (per piece, total linear dimensions) exceed 203cm:10,000yen(100USD)
Japan Domestic(in case CONDITIONS OF CARRIAGE(INTERNATIONAL PASSENGERS BAGGAGE) applied)
Extra piece (per piece) 5,000yen(50USD)(*1)
Overweight (per piece) more than 23kg ~ 32kg or under:1,000yen(10USD)(*1)
more than 32kg ~ 45kg or under:15,000yen(150USD)(*1)
Oversize (per piece, total linear dimensions) exceed 203cm:5,000yen(50USD)(*1)
(*1)Consumption tax excluded
* Note: Maximum checked baggage per passenger is +7 pieces on top of free baggage allowance of each boarding class. For Manila route, maximum of 5 pieces per