Thank you for your quick reply Edd.Don't know about the spec in Japan, but the previous gen Leaf in UK you needed a different charger module for 6kw AC. Possible to do but not cheap.
2018 Leaf Many features are the same as the UK model. Only the biggest difference is the charging port Type 1 and some can charge with 3 kW and some with 6 kW. and if there are 6 options on the menu you are very lucky. but 3 is too slow. so i was hoping to pay some money and get changed.