From Hiroshima Train Station (south exit), take any streetcar other than number 5 to Tatemachi stop - about 20 min. Hiroshima YMCA is a 3 minute walk from there.
From Hiroshima Bus Center, it is a 5 minute walk to Hiroshima YMCA.
From the final Astram Line stop (Ushita), it is a 10 minute walk to Hiroshima YMCA.
From Ujina Port, take a number 1 streetcar to Tatemachi stop - about 30 min. Hiroshima YMCA is a 3 minute walk from there.