The Abandoned Noble's Carefree Island Development Log ~Finally Free, I'm Enjoying a Whimsical Slow Life With My Fluffy Companions

Although born the third son of a count, Leo has no skills of any kind and is treated as a burden by his family and abused. When Leo turns 15, he is given an uninhabitable and dangerous deserted island. Contrary to his family's plan to dispose of him in a proper manner, Leo has actually mastered the skill of being a "puppet". He invokes a special trick that allows him to breathe life into the dolls he creates and manipulate them at will, and cooperates with his partner, Roy, to build a place to live, grow vegetables, and exterminate demons.... Your days of developing the island to your liking, in a relaxed and carefree manner, are about to begin! Although you are just living a carefree life, a dark cat that is supposed to be vicious becomes fond of you, a nobleman who has drifted away from the island likes your life on the island, and before you know it, the number of residents is increasing and the island is developing into a lively territory...? Although exiled, I'm enjoying island life at my own pace with Fluffy and her friends!

https://www.cmoa.jp/title/309892/