The Happosai is larger than its seven sister ships, the Ipposai. It resembles a Chinese junk. It also sports brown sails and a feline figurehead, which resembles a tiger.
In preparation for the Happo Navy and their allies to escape, the Happosai was docked with several other ships far away from the coast. Once the entourage made it to the ships, the Happosai set sail along with all the others. After the Happo Navy pledged their allegiance to the Straw Hat Pirates and partied to celebrate it, they sailed away on the Happosai.