You wake up in an unfamiliar storeroom where you can hear nothing but the sound of waves. As you are trying to figure out why you are here, your reflection in a mirror speaks to you. The reflection tells you to lie, then disappears.
When you leave the storeroom, you meet people who call themselves the Seven Lucky Gods. According to one of them, Daikoku, you are a Human who was chosen to become a god. Most of them do not seem to welcome your sudden arrival.
Once the treasure ship returns to the human world in a year, will you become a god and join the others on the ship? Will you return to your original world as a human? Or will you...?
Your bittersweet year with the Seven Lucky Gods begins.
Source: https://www.nintendo.com/store/products/rainbow-sea-switch/