Dimension Wave: Volume 3

Kizuna: a boy forced to play as a little girl thanks to the mischief of his sisters. Alongside his comrades and the mysterious Pekkles, Kizuna endeavored to develop a deserted island and explore the dungeon hidden within it. One day, after returning from a fishing trip in the dungeon, he encountered an event with a massive Pekkle that could serve as a ship. Aboard the massive Pekkle, he heads for the high seas with hope in his heart. However... “We still can’t leave the island!” If he wants to set off for something new, he’ll first have to secure some supplies from the dungeon. So down he goes once more into the depths.

[From J-Novel Club]