Bartlett Eiyuutan: Slow Life Shitai no ni Dekinai Jakushou Kizoku Funtouki

Ramsey is a boy from Japan reincarnated into another world. Born as a noble, but unable to take over his family because he is the third son, he is given a wasteland as a fiefdom and is practically exiled. Ramsey gathers together a group of boys who are also unable to take over their families to develop the territory!