Blue box ferry which links Hakodate to Aomori by daily round-trip 16 flights until May 31 (but except 4/28 - 5/6), super advantageous plan of blue box route low, "car 11,500 yen (good thing) campaign!" We are carrying this out! If it is car small number of people trip, please use very advantageous blue box ferry in winter in spring!
→For more details, it is this
Blue box ferry