Dr. Emma Collins and her team are spending their third summer on the island of Little Happy studying the effect of climate change on the great white sharks who come to the nearby nursery every year to give birth. Along with the last two inhabitants of this former fishing village, their peaceful life is disrupted when a "scientific" team led by her ex-boyfriend and marine biologist Richard show up looking for three bull sharks who we soon learn aren't just any bull sharks.
Nobuto is a boxer who is not going to be a champion anytime soon. He works hard, trains, attends consistently and yet ends up amassing losses. In the same gym and training with Nobuto is Kazuki. The latter man looks destined for success. He is engaged to Chika who was crushed on by Nobuto when they were children.