Ore dake Chou Tensai Renkinjutsushi: Yuruui Atelier Seikatsu Hajimemashita

Alexant, a reincarnated person who awakened to his memories from his previous life at the age of seven, enrolls in the prestigious Akasha House School at the age of 13, where he discovers alchemy while demonstrating his many talents. A chaotic and laid-back atelier life begins with various companions from Akasha House, including a little witch, a loli elf, and a tanned, energetic girl!!!

(Source: Futabasha, translated)