BRZRKR The Bleeding Tide #1 One Shot

Can B. quell the bleeding tide?

When the Captain follows a strange heartbeat into the depths of the ocean, she finds a box chained in irons — and the deformed mass of legendary warrior B. inside.

Now awakened, B. must jump into battle to defend the crew from an ambush at sea despite rising concerns.

What is the Captain after with such a dangerous bounty on her head, and more importantly, what is she hiding?