Utilize the input text as a context reference, choose the right relationship between 'AirAsia' and 'AirAsia Japan' from the options.
Options: chairperson, currency, director/manager, business division

AirAsia plans to restart services to Japan in 2016 after its revamped low-cost carrier (LCC) subsidiary AirAsia Japan returns to the market following the 2013 collapse of a joint venture with All Nippon Airways (ANA).
business division