Seijuu to Tomoni Ayumu Inja: Renkinjutsushi kara Hajimeru Seisansha Life

Svein Schmidt is a five-year-old boy obsessed with alchemy. During the "Seance Ritual" where he is bestowed with a "profession," he is given the unfortunate, lowest-level job of "Novice," with no particular field of expertise. However, in reality, "Novice" is a special "profession" that holds a little bit of every talent and opens up all possibilities, depending on effort! Svein ends up living with Aria, a girl who was banished from her noble family for being given a low-level job. One day, they rescue some legendary sacred beasts, and the two experience a major turning point in their lives!

(Source: Futabasha, translated)