We infiltrate the Japanese Mansion, run through an underground passage, turn on an elevator that is disguised as a bathroom, discover the need for Bombs and secret passages, acquire the bombs, blow through the door, fall into an underground passage beneath the mansion, get a card key, spin a giant machine. From there we access the terminal to find data on Benigumo, to get Vengeance for the father of Kotetsu and Aska, which doesn’t go over all that great.
