The roads around Hashikami Interchange have changed due to construction to the Hachinohe/Kuji Expressway, so you can no longer use the official Michinoku Coastal Trail route shown on the map near Hashikami IC.
Please take the following course instead.

1 . Relevant maps
Ministry of the Environment trail map: Hashikami
Hiking Map Book: MAP 1-3, 1-5

2. See this map of the area near Hashikami IC.

3. Details about the new route
From Mt. Hashikamidake towards Tate-jinja Shrine
From Tate-jinja shrine towards Mt. Hashikamidake

※Look for the green Michinoku Coastal Trail tape set up in the area to see where to turn.

4. Note there is still construction going on in this region, so construction vehicles go by frequently. Take care during your hike.

(Japanese post https://m-tc.org/news/attention/2224/)