The route circles the urban area of Date, but the point is bigger than ticking off streets: it is an ultra-distance group run built around the city edge and the nearby natural feel. Vol.4 is billed as the Completion Edition, which gives it the sense of closing a hard chapter rather than just adding another casual outing.
Expect a long, patient effort that asks you to keep moving as the town and nature trade places around you. The source phrase “Journey run around Date” fits: this is not a polished parade, it is a small-group day out where the appeal is to “Enjoy the city and nature of Date City” while doing enough work to earn both words, city and nature.