Hoshi no Shima no Nyanko  

ほしの島のにゃんこ, 星之岛喵喵, Kittens of the Island of Stars

Hopi, Toto, and Mao are three cats who embark on a journey across the ocean in search of a new location for their town. They aim to discover the enigmatic "Island of Stars." Upon finding it, they promptly begin constructing the island but face numerous challenges along the way.