This is one of two Ajishima Line Ports in Ishinomaki City and while further from the Station than Chuou port, it can be reached by bus from Ishinomaki station.
You can catch a Miyako bus from stop two at Ishinomaki train station, with buses timed to match ferry departures. Boats run to the popular Tashirojima (better known as one of Japan’s cat islands) three times a day and it costs ¥1,250 each way. It takes a few minutes to buy tickets (via vending machine) from the ferry office and to then walk down to the boat, so ensure you have plenty of time to find your way here and get tickets before the scheduled times.
Japan, 〒986-0834 Miyagi, Ishinomaki, Kadonowakicho, ３丁目１−19