Tensei shitara Dainana Ouji Datta node, Kimama ni Majutsu wo Kiwamemasu

A magic nerd's life came to an end after a dreadful encounter with the nobles who ended his life with a powerful spell. His last wish, being able to study and master more magic, has been answered when he was reincarnated as Lloyd de Saloom, the 7th prince of Saloom Kingdom. Now he'll be able to perfect his magic as he pleases...

(Source: MU)