This trip's itinerary is: Day 1: Narita Airport to Tokyo Station via Narita Express (N'EX), then transfer to the Shinkansen to Yamagata Station. Day 2: Yamagata → Shinjo → Oishida → Yamagata. Originally planned to take a boat tour on the Mogami River, but due to heavy snow, we turned back and went to Ginzan Onsen. Day 3: Took the cable car to Zao in the morning, then took the Shinkansen in the afternoon from Yamagata → Fukushima → Sendai → Tazawako. Day 4: Rode the Tazawako Lake Loop Bus, then took the train from Tazawako → Morioka → Shin-Aomori (Shin-Aomori → Aomori section of the JR line was suspended due to heavy snow, so we took a bus into the city). Day 5: Sightseeing in Aomori city. Shin-Aomori → Shin-Hakodate-Hokuto → Shin-Hakodate-Hokuto → Hakodate (JR Pass, Hakodate Liner is also usable!). Took the cable car up Mount Hakodate to see the night view. Day 6: Strolled around Hakodate city. Hakodate → Toya (Hokuto Limited Express) → Toya Ekimae → Lake Toya Onsen (bus). Enjoyed the Lake Toya Winter Festival Illumination and Musical Fireworks at night, it was incredibly beautiful.