This Summer, Plenty of Breasts

Naeka, Kosuke, Eiko, Miwa, Kogarashi and Fubuki go on a vacation to a deserted beach island to relax. However, relaxation is the last thing they get when they awaken the ancient immortal spirit of a fisherman who is obsessed with breasts and plans to kidnap Naeka, Eiko, Miwa and Fubuki to hypnotize them and turn them into his big boobed slaves.